921640041 has 48 divisors (see below), whose sum is σ = 1540639360. Its totient is φ = 520058880.

The previous prime is 921640037. The next prime is 921640133. The reversal of 921640041 is 140046129.

921640041 is a `hidden beast` number, since 9 + 216 + 400 + 41 = 666.

It is not a de Polignac number, because 921640041 - 2² = 921640037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921639987 and 921640014.

It is not an unprimeable number, because it can be changed into a prime (921640021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2784246 + ... + 2784576.

Almost surely, 2^921640041 is an apocalyptic number.

It is an amenable number.

921640041 is a deficient number, since it is larger than the sum of its proper divisors (618999319).

921640041 is a wasteful number, since it uses less digits than its factorization.

921640041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 921640041 is about 30358.5250135773. The cubic root of 921640041 is about 973.1664126901.

The spelling of 921640041 in words is "nine hundred twenty-one million, six hundred forty thousand, forty-one".