2138888 has 16 divisors (see below), whose sum is σ = 4108860. Its totient is φ = 1043200.

The previous prime is 2138879. The next prime is 2138897. The reversal of 2138888 is 8888312.

It is an interprime number because it is at equal distance from previous prime (2138879) and next prime (2138897).

It can be written as a sum of positive squares in 2 ways, for example, as 2137444 + 1444 = 1462^2 + 38^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2933 + ... + 3588.

2^2138888 is an apocalyptic number.

It is an amenable number.

2138888 is a deficient number, since it is larger than the sum of its proper divisors (1969972).

2138888 is a wasteful number, since it uses less digits than its factorization.

2138888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6568 (or 6564 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 2138888 is about 1462.4937606705. The cubic root of 2138888 is about 128.8435496935.

The spelling of 2138888 in words is "two million, one hundred thirty-eight thousand, eight hundred eighty-eight".