406375921 has 16 divisors (see below), whose sum is σ = 483043840. Its totient is φ = 334601280.

The previous prime is 406375919. The next prime is 406375943. The reversal of 406375921 is 129573604.

It is a cyclic number.

It is not a de Polignac number, because 406375921 - 2¹ = 406375919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406375901) 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, 10531 + ... + 30391.

It is an arithmetic number, because the mean of its divisors is an integer number (30190240).

Almost surely, 2^406375921 is an apocalyptic number.

It is an amenable number.

406375921 is a deficient number, since it is larger than the sum of its proper divisors (76667919).

406375921 is a wasteful number, since it uses less digits than its factorization.

406375921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19984.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 406375921 is about 20158.7678442905. The cubic root of 406375921 is about 740.7005303186.

The spelling of 406375921 in words is "four hundred six million, three hundred seventy-five thousand, nine hundred twenty-one".