40415921 has 8 divisors (see below), whose sum is σ = 49742784. Its totient is φ = 31977360.

The previous prime is 40415917. The next prime is 40415957. The reversal of 40415921 is 12951404.

40415921 = T₇₈ + T₇₉ + ... + T₆₂₃.

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 40415921 - 2² = 40415917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40415321) 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, 221975 + ... + 222156.

It is an arithmetic number, because the mean of its divisors is an integer number (6217848).

Almost surely, 2^40415921 is an apocalyptic number.

It is an amenable number.

40415921 is a deficient number, since it is larger than the sum of its proper divisors (9326863).

40415921 is a wasteful number, since it uses less digits than its factorization.

40415921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444151.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 40415921 is about 6357.3517285109. The cubic root of 40415921 is about 343.1764626202.

The spelling of 40415921 in words is "forty million, four hundred fifteen thousand, nine hundred twenty-one".