40704921 has 24 divisors (see below), whose sum is σ = 60750144. Its totient is φ = 26244000.

The previous prime is 40704887. The next prime is 40704947. The reversal of 40704921 is 12940704.

It is a happy number.

It is not a de Polignac number, because 40704921 - 2¹⁹ = 40180633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40704971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83340 + ... + 83826.

It is an arithmetic number, because the mean of its divisors is an integer number (2531256).

Almost surely, 2^40704921 is an apocalyptic number.

It is an amenable number.

40704921 is a deficient number, since it is larger than the sum of its proper divisors (20045223).

40704921 is a wasteful number, since it uses less digits than its factorization.

40704921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 40704921 is about 6380.0408305903. The cubic root of 40704921 is about 343.9924985970.

The spelling of 40704921 in words is "forty million, seven hundred four thousand, nine hundred twenty-one".