172947988 has 6 divisors (see below), whose sum is σ = 302658986. Its totient is φ = 86473992.

The previous prime is 172947979. The next prime is 172947989. The reversal of 172947988 is 889749271.

It is a happy number.

172947988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 95296644 + 77651344 = 9762^2 + 8812^2 .

It is a super-2 number, since 2×172947988² = 59822013106496288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172947989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21618495 + ... + 21618502.

Almost surely, 2^172947988 is an apocalyptic number.

It is an amenable number.

172947988 is a deficient number, since it is larger than the sum of its proper divisors (129710998).

172947988 is a wasteful number, since it uses less digits than its factorization.

172947988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43237001 (or 43236999 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 55.

The square root of 172947988 is about 13150.9690897667. The cubic root of 172947988 is about 557.1496191659.

The spelling of 172947988 in words is "one hundred seventy-two million, nine hundred forty-seven thousand, nine hundred eighty-eight".