172249398 has 12 divisors (see below), whose sum is σ = 373207068. Its totient is φ = 57416460.

The previous prime is 172249397. The next prime is 172249439. The reversal of 172249398 is 893942271.

172249398 is a `hidden beast` number, since 1 + 72 + 2 + 493 + 98 = 666.

It is a super-2 number, since 2×172249398² = 59339710222724808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172249391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4784688 + ... + 4784723.

It is an arithmetic number, because the mean of its divisors is an integer number (31100589).

Almost surely, 2^172249398 is an apocalyptic number.

172249398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172249398 is an abundant number, since it is smaller than the sum of its proper divisors (200957670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172249398 is a wasteful number, since it uses less digits than its factorization.

172249398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9569419 (or 9569416 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 172249398 is about 13124.3818140132. The cubic root of 172249398 is about 556.3984407438.

The spelling of 172249398 in words is "one hundred seventy-two million, two hundred forty-nine thousand, three hundred ninety-eight".