1390535640 has 128 divisors (see below), whose sum is σ = 4991716800. Its totient is φ = 342282240.

The previous prime is 1390535617. The next prime is 1390535647. The reversal of 1390535640 is 465350931.

1390535640 is a `hidden beast` number, since 1 + 3 + 9 + 0 + 5 + 3 + 5 + 640 = 666.

1390535640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1390535640² = 3867178732220419200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1390535595 and 1390535604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390535647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35481 + ... + 63560.

Almost surely, 2^1390535640 is an apocalyptic number.

1390535640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1390535640 is an abundant number, since it is smaller than the sum of its proper divisors (3601181160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1390535640 is a wasteful number, since it uses less digits than its factorization.

1390535640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99074 (or 99064 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 1390535640 is about 37289.8865645901. The cubic root of 1390535640 is about 1116.1623650921.

The spelling of 1390535640 in words is "one billion, three hundred ninety million, five hundred thirty-five thousand, six hundred forty".