2139405 has 16 divisors (see below), whose sum is σ = 3445440. Its totient is φ = 1133568.

The previous prime is 2139383. The next prime is 2139407. The reversal of 2139405 is 5049312.

It is not a de Polignac number, because 2139405 - 2⁵ = 2139373 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2526 + ... + 3264.

It is an arithmetic number, because the mean of its divisors is an integer number (215340).

2^2139405 is an apocalyptic number.

It is an amenable number.

2139405 is a deficient number, since it is larger than the sum of its proper divisors (1306035).

2139405 is a wasteful number, since it uses less digits than its factorization.

2139405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 2139405 is about 1462.6705028816. The cubic root of 2139405 is about 128.8539299703.

The spelling of 2139405 in words is "two million, one hundred thirty-nine thousand, four hundred five".