1640387914 has 32 divisors (see below), whose sum is σ = 2838052800. Its totient is φ = 703261440.

The previous prime is 1640387897. The next prime is 1640387923. The reversal of 1640387914 is 4197830461.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87154 + ... + 104290.

It is an arithmetic number, because the mean of its divisors is an integer number (88689150).

Almost surely, 2^1640387914 is an apocalyptic number.

1640387914 is a deficient number, since it is larger than the sum of its proper divisors (1197664886).

1640387914 is a wasteful number, since it uses less digits than its factorization.

1640387914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17398.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1640387914 is about 40501.7026061868. The cubic root of 1640387914 is about 1179.3666796847.

The spelling of 1640387914 in words is "one billion, six hundred forty million, three hundred eighty-seven thousand, nine hundred fourteen".