172018390 has 32 divisors (see below), whose sum is σ = 316607616. Its totient is φ = 67267200.

The previous prime is 172018387. The next prime is 172018397. The reversal of 172018390 is 93810271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172018397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245040 + ... + 245740.

It is an arithmetic number, because the mean of its divisors is an integer number (9893988).

Almost surely, 2^172018390 is an apocalyptic number.

172018390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172018390 is a deficient number, since it is larger than the sum of its proper divisors (144589226).

172018390 is a wasteful number, since it uses less digits than its factorization.

172018390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 172018390 is about 13115.5781420416. The cubic root of 172018390 is about 556.1495961524.

The spelling of 172018390 in words is "one hundred seventy-two million, eighteen thousand, three hundred ninety".