161316440 has 16 divisors (see below), whose sum is σ = 362962080. Its totient is φ = 64526560.

The previous prime is 161316439. The next prime is 161316461. The reversal of 161316440 is 44613161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2016416 + ... + 2016495.

It is an arithmetic number, because the mean of its divisors is an integer number (22685130).

Almost surely, 2^161316440 is an apocalyptic number.

161316440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161316440 is an abundant number, since it is smaller than the sum of its proper divisors (201645640).

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

161316440 is a wasteful number, since it uses less digits than its factorization.

161316440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032922 (or 4032918 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 161316440 is about 12701.0409022253. The cubic root of 161316440 is about 544.3683617441.

The spelling of 161316440 in words is "one hundred sixty-one million, three hundred sixteen thousand, four hundred forty".