100172405 has 8 divisors (see below), whose sum is σ = 120355200. Its totient is φ = 80039056.

The previous prime is 100172399. The next prime is 100172407. The reversal of 100172405 is 504271001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100172405 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100172407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7745 + ... + 16134.

It is an arithmetic number, because the mean of its divisors is an integer number (15044400).

Almost surely, 2^100172405 is an apocalyptic number.

It is an amenable number.

100172405 is a deficient number, since it is larger than the sum of its proper divisors (20182795).

100172405 is an equidigital number, since it uses as much as digits as its factorization.

100172405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24723.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 100172405 is about 10008.6165377638. The cubic root of 100172405 is about 464.4254745887.

The spelling of 100172405 in words is "one hundred million, one hundred seventy-two thousand, four hundred five".