169972290 has 128 divisors (see below), whose sum is σ = 505440000. Its totient is φ = 40393728.

The previous prime is 169972279. The next prime is 169972303. The reversal of 169972290 is 92279961.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 86236 + ... + 88184.

It is an arithmetic number, because the mean of its divisors is an integer number (3948750).

Almost surely, 2^169972290 is an apocalyptic number.

169972290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 169972290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252720000).

169972290 is an abundant number, since it is smaller than the sum of its proper divisors (335467710).

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

169972290 is a wasteful number, since it uses less digits than its factorization.

169972290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001 (or 1995 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 169972290 is about 13037.3421371075. The cubic root of 169972290 is about 553.9357252301.

The spelling of 169972290 in words is "one hundred sixty-nine million, nine hundred seventy-two thousand, two hundred ninety".