180997605 has 16 divisors (see below), whose sum is σ = 321773760. Its totient is φ = 96531984.

The previous prime is 180997577. The next prime is 180997631. The reversal of 180997605 is 506799081.

It is not a de Polignac number, because 180997605 - 2⁶ = 180997541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670227 + ... + 670496.

It is an arithmetic number, because the mean of its divisors is an integer number (20110860).

Almost surely, 2^180997605 is an apocalyptic number.

180997605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

180997605 is a deficient number, since it is larger than the sum of its proper divisors (140776155).

180997605 is a wasteful number, since it uses less digits than its factorization.

180997605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340737 (or 1340731 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 180997605 is about 13453.5350373053. The cubic root of 180997605 is about 565.6627876019.

The spelling of 180997605 in words is "one hundred eighty million, nine hundred ninety-seven thousand, six hundred five".