161384772 has 24 divisors (see below), whose sum is σ = 382739392. Its totient is φ = 52912800.

The previous prime is 161384771. The next prime is 161384779. The reversal of 161384772 is 277483161.

It is a self number, because there is not a number n which added to its sum of digits gives 161384772.

It is not an unprimeable number, because it can be changed into a prime (161384771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109504 + ... + 110967.

Almost surely, 2^161384772 is an apocalyptic number.

161384772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161384772 is an abundant number, since it is smaller than the sum of its proper divisors (221354620).

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

161384772 is a wasteful number, since it uses less digits than its factorization.

161384772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220539 (or 220537 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 161384772 is about 12703.7306331644. The cubic root of 161384772 is about 544.4452138573.

It can be divided in two parts, 16138 and 4772, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 161384772 in words is "one hundred sixty-one million, three hundred eighty-four thousand, seven hundred seventy-two".