172398105 has 64 divisors (see below), whose sum is σ = 354067200. Its totient is φ = 78658560.

The previous prime is 172398103. The next prime is 172398131. The reversal of 172398105 is 501893271.

It is not a de Polignac number, because 172398105 - 2¹ = 172398103 is a prime.

It is a super-2 number, since 2×172398105² = 59442213215182050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172398105.

It is not an unprimeable number, because it can be changed into a prime (172398103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21831 + ... + 28659.

It is an arithmetic number, because the mean of its divisors is an integer number (5532300).

Almost surely, 2^172398105 is an apocalyptic number.

172398105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172398105 is an abundant number, since it is smaller than the sum of its proper divisors (181669095).

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

172398105 is a wasteful number, since it uses less digits than its factorization.

172398105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6871 (or 6865 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 172398105 is about 13130.0458872009. The cubic root of 172398105 is about 556.5585120218.

The spelling of 172398105 in words is "one hundred seventy-two million, three hundred ninety-eight thousand, one hundred five".