2172400436 has 6 divisors (see below), whose sum is σ = 3801700770. Its totient is φ = 1086200216.

The previous prime is 2172400409. The next prime is 2172400441. The reversal of 2172400436 is 6340042712.

It can be written as a sum of positive squares in only one way, i.e., 2101672336 + 70728100 = 45844^2 + 8410^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2172400399 and 2172400408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271550051 + ... + 271550058.

It is an arithmetic number, because the mean of its divisors is an integer number (633616795).

Almost surely, 2^2172400436 is an apocalyptic number.

It is an amenable number.

2172400436 is a deficient number, since it is larger than the sum of its proper divisors (1629300334).

2172400436 is a wasteful number, since it uses less digits than its factorization.

2172400436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543100113 (or 543100111 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 2172400436 is about 46609.0166813247. The cubic root of 2172400436 is about 1295.1297924501.

The spelling of 2172400436 in words is "two billion, one hundred seventy-two million, four hundred thousand, four hundred thirty-six".