161939456 has 68 divisors (see below), whose sum is σ = 371193072. Its totient is φ = 69206016.

The previous prime is 161939441. The next prime is 161939473. The reversal of 161939456 is 654939161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458576 + ... + 458928.

Almost surely, 2^161939456 is an apocalyptic number.

161939456 is a gapful number since it is divisible by the number (16) 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 161939456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185596536).

161939456 is an abundant number, since it is smaller than the sum of its proper divisors (209253616).

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

161939456 is an frugal number, since it uses more digits than its factorization.

161939456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 362 counting only the distinct ones).

The product of its digits is 174960, while the sum is 44.

The square root of 161939456 is about 12725.5434461558. The cubic root of 161939456 is about 545.0682584315.

The spelling of 161939456 in words is "one hundred sixty-one million, nine hundred thirty-nine thousand, four hundred fifty-six".