405232921 has 8 divisors (see below), whose sum is σ = 420166080. Its totient is φ = 390363792.

The previous prime is 405232913. The next prime is 405232957. The reversal of 405232921 is 129232504.

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 405232921 - 2³ = 405232913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405232921.

It is not an unprimeable number, because it can be changed into a prime (405232021) 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, 2925 + ... + 28618.

It is an arithmetic number, because the mean of its divisors is an integer number (52520760).

Almost surely, 2^405232921 is an apocalyptic number.

It is an amenable number.

405232921 is a deficient number, since it is larger than the sum of its proper divisors (14933159).

405232921 is a wasteful number, since it uses less digits than its factorization.

405232921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32015.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 405232921 is about 20130.3979344672. The cubic root of 405232921 is about 740.0054303229.

The spelling of 405232921 in words is "four hundred five million, two hundred thirty-two thousand, nine hundred twenty-one".