169920972 has 72 divisors (see below), whose sum is σ = 466946480. Its totient is φ = 51788160.

The previous prime is 169920953. The next prime is 169920973. The reversal of 169920972 is 279029961.

It is not an unprimeable number, because it can be changed into a prime (169920973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49347 + ... + 52677.

Almost surely, 2^169920972 is an apocalyptic number.

169920972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 169920972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233473240).

169920972 is an abundant number, since it is smaller than the sum of its proper divisors (297025508).

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

169920972 is a wasteful number, since it uses less digits than its factorization.

169920972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463 (or 3458 counting only the distinct ones).

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

The square root of 169920972 is about 13035.3738726590. The cubic root of 169920972 is about 553.8799715640.

The spelling of 169920972 in words is "one hundred sixty-nine million, nine hundred twenty thousand, nine hundred seventy-two".