2138740 has 12 divisors (see below), whose sum is σ = 4491396. Its totient is φ = 855488.

The previous prime is 2138737. The next prime is 2138743. The reversal of 2138740 is 478312.

It is an interprime number because it is at equal distance from previous prime (2138737) and next prime (2138743).

It can be written as a sum of positive squares in 2 ways, for example, as 820836 + 1317904 = 906^2 + 1148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53449 + ... + 53488.

It is an arithmetic number, because the mean of its divisors is an integer number (374283).

2^2138740 is an apocalyptic number.

2138740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2138740 is an abundant number, since it is smaller than the sum of its proper divisors (2352656).

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

2138740 is a wasteful number, since it uses less digits than its factorization.

2138740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106946 (or 106944 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 2138740 is about 1462.4431612887. The cubic root of 2138740 is about 128.8405778556.

The spelling of 2138740 in words is "two million, one hundred thirty-eight thousand, seven hundred forty".