1640850923 has 4 divisors (see below), whose sum is σ = 1642155480. Its totient is φ = 1639546368.

The previous prime is 1640850907. The next prime is 1640850929. The reversal of 1640850923 is 3290580461.

It is a happy number.

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 1640850923 - 2⁴ = 1640850907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640850929) 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, 650390 + ... + 652907.

It is an arithmetic number, because the mean of its divisors is an integer number (410538870).

Almost surely, 2^1640850923 is an apocalyptic number.

1640850923 is a deficient number, since it is larger than the sum of its proper divisors (1304557).

1640850923 is a wasteful number, since it uses less digits than its factorization.

1640850923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304556.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 1640850923 is about 40507.4181231043. The cubic root of 1640850923 is about 1179.4776302744.

The spelling of 1640850923 in words is "one billion, six hundred forty million, eight hundred fifty thousand, nine hundred twenty-three".