2138940 has 96 divisors (see below), whose sum is σ = 7076160. Its totient is φ = 534528.

The previous prime is 2138909. The next prime is 2138971. The reversal of 2138940 is 498312.

It is an interprime number because it is at equal distance from previous prime (2138909) and next prime (2138971).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9064 + ... + 9296.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2^2138940 is an apocalyptic number.

2138940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3538080).

2138940 is an abundant number, since it is smaller than the sum of its proper divisors (4937220).

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

2138940 is a wasteful number, since it uses less digits than its factorization.

2138940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2138940 is about 1462.5115384160. The cubic root of 2138940 is about 128.8445938202.

The spelling of 2138940 in words is "two million, one hundred thirty-eight thousand, nine hundred forty".