2172400405 has 16 divisors (see below), whose sum is σ = 3002757120. Its totient is φ = 1477913472.

The previous prime is 2172400337. The next prime is 2172400409. The reversal of 2172400405 is 5040042712.

It is not a de Polignac number, because 2172400405 - 2²⁷ = 2038182677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2172400405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172400409) 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, 239920 + ... + 248809.

It is an arithmetic number, because the mean of its divisors is an integer number (187672320).

Almost surely, 2^2172400405 is an apocalyptic number.

It is an amenable number.

2172400405 is a deficient number, since it is larger than the sum of its proper divisors (830356715).

2172400405 is a wasteful number, since it uses less digits than its factorization.

2172400405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488868.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 2172400405 is about 46609.0163487710. The cubic root of 2172400405 is about 1295.1297862896.

The spelling of 2172400405 in words is "two billion, one hundred seventy-two million, four hundred thousand, four hundred five".