40256921 has 8 divisors (see below), whose sum is σ = 40694400. Its totient is φ = 39822160.

The previous prime is 40256917. The next prime is 40256963. The reversal of 40256921 is 12965204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40256921 - 2² = 40256917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40256911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42311 + ... + 43251.

It is an arithmetic number, because the mean of its divisors is an integer number (5086800).

Almost surely, 2^40256921 is an apocalyptic number.

It is an amenable number.

40256921 is a deficient number, since it is larger than the sum of its proper divisors (437479).

40256921 is a wasteful number, since it uses less digits than its factorization.

40256921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40256921 is about 6344.8341979913. The cubic root of 40256921 is about 342.7258417784.

The spelling of 40256921 in words is "forty million, two hundred fifty-six thousand, nine hundred twenty-one".