161420400 has 90 divisors (see below), whose sum is σ = 560186120. Its totient is φ = 43044480.

The previous prime is 161420377. The next prime is 161420407. The reversal of 161420400 is 4024161.

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161420407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18820 + ... + 26019.

Almost surely, 2^161420400 is an apocalyptic number.

161420400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161420400 is an abundant number, since it is smaller than the sum of its proper divisors (398765720).

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

161420400 is a wasteful number, since it uses less digits than its factorization.

161420400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44863 (or 44849 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 161420400 is about 12705.1328210295. The cubic root of 161420400 is about 544.4852756025.

Adding to 161420400 its reverse (4024161), we get a palindrome (165444561).

The spelling of 161420400 in words is "one hundred sixty-one million, four hundred twenty thousand, four hundred".