161808374 has 24 divisors (see below), whose sum is σ = 300368880. Its totient is φ = 64011168.

The previous prime is 161808373. The next prime is 161808377. The reversal of 161808374 is 473808161.

161808374 = 3522² + 3523² + ... + 3534².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161808373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31829 + ... + 36560.

It is an arithmetic number, because the mean of its divisors is an integer number (12515370).

Almost surely, 2^161808374 is an apocalyptic number.

161808374 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161808374 is a deficient number, since it is larger than the sum of its proper divisors (138560506).

161808374 is a wasteful number, since it uses less digits than its factorization.

161808374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68424 (or 68411 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 161808374 is about 12720.3920537065. The cubic root of 161808374 is about 544.9211501110.

The spelling of 161808374 in words is "one hundred sixty-one million, eight hundred eight thousand, three hundred seventy-four".