2138656406 has 16 divisors (see below), whose sum is σ = 3403469664. Its totient is φ = 1004417664.

The previous prime is 2138656381. The next prime is 2138656433. The reversal of 2138656406 is 6046568312.

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, 45425 + ... + 79628.

It is an arithmetic number, because the mean of its divisors is an integer number (212716854).

Almost surely, 2^2138656406 is an apocalyptic number.

2138656406 is a deficient number, since it is larger than the sum of its proper divisors (1264813258).

2138656406 is a wasteful number, since it uses less digits than its factorization.

2138656406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125575.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 2138656406 is about 46245.6095862083. The cubic root of 2138656406 is about 1288.3889922867.

The spelling of 2138656406 in words is "two billion, one hundred thirty-eight million, six hundred fifty-six thousand, four hundred six".