408923921 has 8 divisors (see below), whose sum is σ = 467579904. Its totient is φ = 350327520.

The previous prime is 408923917. The next prime is 408923951. The reversal of 408923921 is 129329804.

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 408923921 - 2² = 408923917 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 (408923951) 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, 941 + ... + 28613.

It is an arithmetic number, because the mean of its divisors is an integer number (58447488).

Almost surely, 2^408923921 is an apocalyptic number.

It is an amenable number.

408923921 is a deficient number, since it is larger than the sum of its proper divisors (58655983).

408923921 is a wasteful number, since it uses less digits than its factorization.

408923921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29791.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 408923921 is about 20221.8673964597. The cubic root of 408923921 is about 742.2453840972.

The spelling of 408923921 in words is "four hundred eight million, nine hundred twenty-three thousand, nine hundred twenty-one".