2638940 has 12 divisors (see below), whose sum is σ = 5541816. Its totient is φ = 1055568.

The previous prime is 2638931. The next prime is 2638949. The reversal of 2638940 is 498362.

It is an interprime number because it is at equal distance from previous prime (2638931) and next prime (2638949).

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 2⁷ + 6⁵ + 3⁷ + 8⁷ + 9⁶ + 4⁴ + 0 .

It is a junction number, because it is equal to n+sod(n) for n = 2638897 and 2638906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638949) 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, 65954 + ... + 65993.

It is an arithmetic number, because the mean of its divisors is an integer number (461818).

2^2638940 is an apocalyptic number.

2638940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2638940 is an abundant number, since it is smaller than the sum of its proper divisors (2902876).

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

2638940 is a wasteful number, since it uses less digits than its factorization.

2638940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131956 (or 131954 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 2638940 is about 1624.4814557267. The cubic root of 2638940 is about 138.1899645264.

The spelling of 2638940 in words is "two million, six hundred thirty-eight thousand, nine hundred forty".