172406408 has 8 divisors (see below), whose sum is σ = 323262030. Its totient is φ = 86203200.

The previous prime is 172406371. The next prime is 172406419. The reversal of 172406408 is 804604271.

It can be written as a sum of positive squares in only one way, i.e., 139665124 + 32741284 = 11818^2 + 5722^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10775393 + ... + 10775408.

Almost surely, 2^172406408 is an apocalyptic number.

It is an amenable number.

172406408 is a deficient number, since it is larger than the sum of its proper divisors (150855622).

172406408 is a wasteful number, since it uses less digits than its factorization.

172406408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21550807 (or 21550803 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 172406408 is about 13130.3620665997. The cubic root of 172406408 is about 556.5674468283.

The spelling of 172406408 in words is "one hundred seventy-two million, four hundred six thousand, four hundred eight".