2139408 has 60 divisors (see below), whose sum is σ = 6093360. Its totient is φ = 700608.

The previous prime is 2139407. The next prime is 2139409. The reversal of 2139408 is 8049312.

It is an interprime number because it is at equal distance from previous prime (2139407) and next prime (2139409).

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2139407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11863 + ... + 12041.

It is an arithmetic number, because the mean of its divisors is an integer number (101556).

2^2139408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2139408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3046680).

2139408 is an abundant number, since it is smaller than the sum of its proper divisors (3953952).

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

2139408 is a wasteful number, since it uses less digits than its factorization.

2139408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 267 counting only the distinct ones).

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

The square root of 2139408 is about 1462.6715284027. The cubic root of 2139408 is about 128.8539901992.

The spelling of 2139408 in words is "two million, one hundred thirty-nine thousand, four hundred eight".