161389800 has 576 divisors, whose sum is σ = 692664000. Its totient is φ = 34214400.

The previous prime is 161389763. The next prime is 161389807. The reversal of 161389800 is 8983161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161389807) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 8494191 + ... + 8494209.

Almost surely, 2^161389800 is an apocalyptic number.

161389800 is a gapful number since it is divisible by the number (10) 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 161389800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346332000).

161389800 is an abundant number, since it is smaller than the sum of its proper divisors (531274200).

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

161389800 is a wasteful number, since it uses less digits than its factorization.

161389800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 161389800 is about 12703.9285262473. The cubic root of 161389800 is about 544.4508679267.

The spelling of 161389800 in words is "one hundred sixty-one million, three hundred eighty-nine thousand, eight hundred".