161938392 has 64 divisors (see below), whose sum is σ = 504748800. Its totient is φ = 42061440.

The previous prime is 161938391. The next prime is 161938393. The reversal of 161938392 is 293839161.

It is an interprime number because it is at equal distance from previous prime (161938391) and next prime (161938393).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161938391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41967 + ... + 45662.

It is an arithmetic number, because the mean of its divisors is an integer number (7886700).

Almost surely, 2^161938392 is an apocalyptic number.

161938392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161938392 is an abundant number, since it is smaller than the sum of its proper divisors (342810408).

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

161938392 is a wasteful number, since it uses less digits than its factorization.

161938392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87656 (or 87652 counting only the distinct ones).

The product of its digits is 69984, while the sum is 42.

The square root of 161938392 is about 12725.5016404070. The cubic root of 161938392 is about 545.0670646646.

The spelling of 161938392 in words is "one hundred sixty-one million, nine hundred thirty-eight thousand, three hundred ninety-two".