161439738 has 8 divisors (see below), whose sum is σ = 322879488. Its totient is φ = 53813244.

The previous prime is 161439721. The next prime is 161439757. The reversal of 161439738 is 837934161.

It is a sphenic number, since it is the product of 3 distinct primes.

161439738 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 161439738.

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, 13453306 + ... + 13453317.

It is an arithmetic number, because the mean of its divisors is an integer number (40359936).

Almost surely, 2^161439738 is an apocalyptic number.

161439738 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161439738 is a wasteful number, since it uses less digits than its factorization.

161439738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26906628.

The product of its digits is 108864, while the sum is 42.

The square root of 161439738 is about 12705.8938292432. The cubic root of 161439738 is about 544.5070176620.

The spelling of 161439738 in words is "one hundred sixty-one million, four hundred thirty-nine thousand, seven hundred thirty-eight".