1620040 has 32 divisors (see below), whose sum is σ = 3690360. Its totient is φ = 640000.

The previous prime is 1620019. The next prime is 1620041. The reversal of 1620040 is 400261.

It can be written as a sum of positive squares in 4 ways, for example, as 1572516 + 47524 = 1254^2 + 218^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1620040.

It is not an unprimeable number, because it can be changed into a prime (1620041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3840 + ... + 4240.

2^1620040 is an apocalyptic number.

1620040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620040 is an abundant number, since it is smaller than the sum of its proper divisors (2070320).

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

1620040 is a wasteful number, since it uses less digits than its factorization.

1620040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1620040 is about 1272.8079195228. The cubic root of 1620040 is about 117.4469958611.

The spelling of 1620040 in words is "one million, six hundred twenty thousand, forty".