161909600 has 36 divisors (see below), whose sum is σ = 395263764. Its totient is φ = 64763520.

The previous prime is 161909597. The next prime is 161909611. The reversal of 161909600 is 6909161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100394 + ... + 101993.

It is an arithmetic number, because the mean of its divisors is an integer number (10979549).

Almost surely, 2^161909600 is an apocalyptic number.

161909600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161909600 is an abundant number, since it is smaller than the sum of its proper divisors (233354164).

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

161909600 is a wasteful number, since it uses less digits than its factorization.

161909600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202407 (or 202394 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 161909600 is about 12724.3703184087. The cubic root of 161909600 is about 545.0347591668.

The spelling of 161909600 in words is "one hundred sixty-one million, nine hundred nine thousand, six hundred".