161386939 has 12 divisors (see below), whose sum is σ = 189403704. Its totient is φ = 137102784.

The previous prime is 161386913. The next prime is 161386957. The reversal of 161386939 is 939683161.

It is not a de Polignac number, because 161386939 - 2¹⁷ = 161255867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161386339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9037 + ... + 20110.

It is an arithmetic number, because the mean of its divisors is an integer number (15783642).

Almost surely, 2^161386939 is an apocalyptic number.

161386939 is a deficient number, since it is larger than the sum of its proper divisors (28016765).

161386939 is a wasteful number, since it uses less digits than its factorization.

161386939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29274 (or 29267 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 161386939 is about 12703.8159227848. The cubic root of 161386939 is about 544.4476506992.

The spelling of 161386939 in words is "one hundred sixty-one million, three hundred eighty-six thousand, nine hundred thirty-nine".