40457921 has 16 divisors (see below), whose sum is σ = 47464704. Its totient is φ = 33768384.

The previous prime is 40457917. The next prime is 40457941. The reversal of 40457921 is 12975404.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40457921 - 2² = 40457917 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40457941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61631 + ... + 62283.

It is an arithmetic number, because the mean of its divisors is an integer number (2966544).

Almost surely, 2^40457921 is an apocalyptic number.

It is an amenable number.

40457921 is a deficient number, since it is larger than the sum of its proper divisors (7006783).

40457921 is a wasteful number, since it uses less digits than its factorization.

40457921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 40457921 is about 6360.6541330275. The cubic root of 40457921 is about 343.2952971552.

The spelling of 40457921 in words is "forty million, four hundred fifty-seven thousand, nine hundred twenty-one".