2138631 has 16 divisors (see below), whose sum is σ = 3135360. Its totient is φ = 1285920.

The previous prime is 2138629. The next prime is 2138657. The reversal of 2138631 is 1368312.

It is not a de Polignac number, because 2138631 - 2¹ = 2138629 is a prime.

It is a super-2 number, since 2×2138631² = 9147485108322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7416 + ... + 7698.

It is an arithmetic number, because the mean of its divisors is an integer number (195960).

2^2138631 is an apocalyptic number.

2138631 is a deficient number, since it is larger than the sum of its proper divisors (996729).

2138631 is a wasteful number, since it uses less digits than its factorization.

2138631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526.

The product of its digits is 864, while the sum is 24.

The square root of 2138631 is about 1462.4058944083. The cubic root of 2138631 is about 128.8383890495.

It can be divided in two parts, 213 and 8631, that multiplied together give a triangular number (1838403 = T₁₉₁₇).

The spelling of 2138631 in words is "two million, one hundred thirty-eight thousand, six hundred thirty-one".