172321372 has 12 divisors (see below), whose sum is σ = 301756000. Its totient is φ = 86105376.

The previous prime is 172321361. The next prime is 172321381. The reversal of 172321372 is 273123271.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 172321372.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6372 + ... + 19627.

Almost surely, 2^172321372 is an apocalyptic number.

It is an amenable number.

172321372 is a deficient number, since it is larger than the sum of its proper divisors (129434628).

172321372 is a wasteful number, since it uses less digits than its factorization.

172321372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27660 (or 27658 counting only the distinct ones).

The product of its digits is 3528, while the sum is 28.

The square root of 172321372 is about 13127.1235234533. The cubic root of 172321372 is about 556.4759265394.

The spelling of 172321372 in words is "one hundred seventy-two million, three hundred twenty-one thousand, three hundred seventy-two".