1400015664 has 50 divisors (see below), whose sum is σ = 4052055260. Its totient is φ = 466671456.

The previous prime is 1400015663. The next prime is 1400015689. The reversal of 1400015664 is 4665100041.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1400015663) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 538834 + ... + 541425.

Almost surely, 2^1400015664 is an apocalyptic number.

It is an amenable number.

1400015664 is an abundant number, since it is smaller than the sum of its proper divisors (2652039596).

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

1400015664 is a wasteful number, since it uses less digits than its factorization.

1400015664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080279 (or 1080264 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1400015664 is about 37416.7831861586. The cubic root of 1400015664 is about 1118.6931142429.

The spelling of 1400015664 in words is "one billion, four hundred million, fifteen thousand, six hundred sixty-four".