1640690374 has 16 divisors (see below), whose sum is σ = 2483933760. Its totient is φ = 812733480.

The previous prime is 1640690369. The next prime is 1640690377. The reversal of 1640690374 is 4730960461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640690377) 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, 163597 + ... + 173335.

It is an arithmetic number, because the mean of its divisors is an integer number (155245860).

Almost surely, 2^1640690374 is an apocalyptic number.

1640690374 is a deficient number, since it is larger than the sum of its proper divisors (843243386).

1640690374 is a wasteful number, since it uses less digits than its factorization.

1640690374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 1640690374 is about 40505.4363511862. The cubic root of 1640690374 is about 1179.4391603708.

The spelling of 1640690374 in words is "one billion, six hundred forty million, six hundred ninety thousand, three hundred seventy-four".