406628387 has 4 divisors (see below), whose sum is σ = 443594616. Its totient is φ = 369662160.

The previous prime is 406628363. The next prime is 406628429. The reversal of 406628387 is 783826604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 406628387 - 2²² = 402434083 is a prime.

It is a super-2 number, since 2×406628387² = 330693290228443538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406628317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18483098 + ... + 18483119.

It is an arithmetic number, because the mean of its divisors is an integer number (110898654).

Almost surely, 2^406628387 is an apocalyptic number.

406628387 is a deficient number, since it is larger than the sum of its proper divisors (36966229).

406628387 is a wasteful number, since it uses less digits than its factorization.

406628387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36966228.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 406628387 is about 20165.0288122780. The cubic root of 406628387 is about 740.8538883122.

The spelling of 406628387 in words is "four hundred six million, six hundred twenty-eight thousand, three hundred eighty-seven".