406574021 has 16 divisors (see below), whose sum is σ = 489446400. Its totient is φ = 337241520.

The previous prime is 406573991. The next prime is 406574029. The reversal of 406574021 is 120475604.

It is not a de Polignac number, because 406574021 - 2¹⁰ = 406572997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406574029) 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, 8486 + ... + 29751.

It is an arithmetic number, because the mean of its divisors is an integer number (30590400).

Almost surely, 2^406574021 is an apocalyptic number.

It is an amenable number.

406574021 is a deficient number, since it is larger than the sum of its proper divisors (82872379).

406574021 is an equidigital number, since it uses as much as digits as its factorization.

406574021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38289 (or 38275 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 406574021 is about 20163.6807403807. The cubic root of 406574021 is about 740.8208695832.

The spelling of 406574021 in words is "four hundred six million, five hundred seventy-four thousand, twenty-one".