161401920 has 56 divisors (see below), whose sum is σ = 512454144. Its totient is φ = 43040256.

The previous prime is 161401897. The next prime is 161401921. The reversal of 161401920 is 29104161.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (161401921) 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, 83104 + ... + 85023.

Almost surely, 2^161401920 is an apocalyptic number.

161401920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161401920 is an abundant number, since it is smaller than the sum of its proper divisors (351052224).

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

161401920 is a wasteful number, since it uses less digits than its factorization.

161401920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168147 (or 168137 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 161401920 is about 12704.4055350890. The cubic root of 161401920 is about 544.4644965851.

The spelling of 161401920 in words is "one hundred sixty-one million, four hundred one thousand, nine hundred twenty".