1640325907 has 4 divisors (see below), whose sum is σ = 1789446456. Its totient is φ = 1491205360.

The previous prime is 1640325899. The next prime is 1640325919. The reversal of 1640325907 is 7095230461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1640325907 - 2³ = 1640325899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640325307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74560258 + ... + 74560279.

It is an arithmetic number, because the mean of its divisors is an integer number (447361614).

Almost surely, 2^1640325907 is an apocalyptic number.

1640325907 is a deficient number, since it is larger than the sum of its proper divisors (149120549).

1640325907 is a wasteful number, since it uses less digits than its factorization.

1640325907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149120548.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1640325907 is about 40500.9371126151. The cubic root of 1640325907 is about 1179.3518193966.

The spelling of 1640325907 in words is "one billion, six hundred forty million, three hundred twenty-five thousand, nine hundred seven".