906811638 has 16 divisors (see below), whose sum is σ = 1816648176. Its totient is φ = 301766400.

The previous prime is 906811627. The next prime is 906811669. The reversal of 906811638 is 836118609.

It is a self number, because there is not a number n which added to its sum of digits gives 906811638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122131 + ... + 129342.

It is an arithmetic number, because the mean of its divisors is an integer number (113540511).

Almost surely, 2^906811638 is an apocalyptic number.

906811638 is an abundant number, since it is smaller than the sum of its proper divisors (909836538).

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

906811638 is a wasteful number, since it uses less digits than its factorization.

906811638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252079.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 906811638 is about 30113.3133015947. The cubic root of 906811638 is about 967.9190298083.

It can be divided in two parts, 9068 and 11638, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 906811638 in words is "nine hundred six million, eight hundred eleven thousand, six hundred thirty-eight".