161389718 has 32 divisors (see below), whose sum is σ = 281069568. Its totient is φ = 68076000.

The previous prime is 161389693. The next prime is 161389729. The reversal of 161389718 is 817983161.

It is a super-2 number, since 2×161389718² = 52093282152239048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439571 + ... + 439937.

It is an arithmetic number, because the mean of its divisors is an integer number (8783424).

Almost surely, 2^161389718 is an apocalyptic number.

161389718 is a deficient number, since it is larger than the sum of its proper divisors (119679850).

161389718 is a wasteful number, since it uses less digits than its factorization.

161389718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788.

The product of its digits is 72576, while the sum is 44.

The square root of 161389718 is about 12703.9252988988. The cubic root of 161389718 is about 544.4507757173.

The spelling of 161389718 in words is "one hundred sixty-one million, three hundred eighty-nine thousand, seven hundred eighteen".