161397420 has 24 divisors (see below), whose sum is σ = 451912944. Its totient is φ = 43039296.

The previous prime is 161397373. The next prime is 161397421. The reversal of 161397420 is 24793161.

It is not an unprimeable number, because it can be changed into a prime (161397421) 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, 1344919 + ... + 1345038.

It is an arithmetic number, because the mean of its divisors is an integer number (18829706).

Almost surely, 2^161397420 is an apocalyptic number.

161397420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161397420 is an abundant number, since it is smaller than the sum of its proper divisors (290515524).

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

161397420 is a wasteful number, since it uses less digits than its factorization.

161397420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689969 (or 2689967 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 161397420 is about 12704.2284299362. The cubic root of 161397420 is about 544.4594365193.

The spelling of 161397420 in words is "one hundred sixty-one million, three hundred ninety-seven thousand, four hundred twenty".