406139690 has 64 divisors (see below), whose sum is σ = 862576128. Its totient is φ = 136012800.

The previous prime is 406139677. The next prime is 406139719. The reversal of 406139690 is 96931604.

It is a super-2 number, since 2×406139690² = 329898895586592200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85580 + ... + 90200.

It is an arithmetic number, because the mean of its divisors is an integer number (13477752).

Almost surely, 2^406139690 is an apocalyptic number.

406139690 is an abundant number, since it is smaller than the sum of its proper divisors (456436438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406139690 is a wasteful number, since it uses less digits than its factorization.

406139690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 406139690 is about 20152.9077306477. The cubic root of 406139690 is about 740.5569765841.

The spelling of 406139690 in words is "four hundred six million, one hundred thirty-nine thousand, six hundred ninety".