213838638 has 16 divisors (see below), whose sum is σ = 460575696. Its totient is φ = 65796480.

The previous prime is 213838633. The next prime is 213838643. The reversal of 213838638 is 836838312.

It is an interprime number because it is at equal distance from previous prime (213838633) and next prime (213838643).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213838638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213838633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1370683 + ... + 1370838.

It is an arithmetic number, because the mean of its divisors is an integer number (28785981).

Almost surely, 2^213838638 is an apocalyptic number.

213838638 is an abundant number, since it is smaller than the sum of its proper divisors (246737058).

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

213838638 is a wasteful number, since it uses less digits than its factorization.

213838638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741539.

The product of its digits is 165888, while the sum is 42.

The square root of 213838638 is about 14623.2225586565. Note that the first 3 decimals coincide. The cubic root of 213838638 is about 597.9920264557.

The spelling of 213838638 in words is "two hundred thirteen million, eight hundred thirty-eight thousand, six hundred thirty-eight".