172013978 has 8 divisors (see below), whose sum is σ = 266344320. Its totient is φ = 83232540.

The previous prime is 172013957. The next prime is 172014019. The reversal of 172013978 is 879310271.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387148 + ... + 1387271.

It is an arithmetic number, because the mean of its divisors is an integer number (33293040).

Almost surely, 2^172013978 is an apocalyptic number.

172013978 is a deficient number, since it is larger than the sum of its proper divisors (94330342).

172013978 is a wasteful number, since it uses less digits than its factorization.

172013978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774452.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 172013978 is about 13115.4099440315. The cubic root of 172013978 is about 556.1448413255.

The spelling of 172013978 in words is "one hundred seventy-two million, thirteen thousand, nine hundred seventy-eight".