161583438 has 16 divisors (see below), whose sum is σ = 323393616. Its totient is φ = 53823360.

The previous prime is 161583437. The next prime is 161583451. The reversal of 161583438 is 834385161.

It is a super-2 number, since 2×161583438² = 52218414871799688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161583396 and 161583405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161583437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648 + ... + 17988.

It is an arithmetic number, because the mean of its divisors is an integer number (20212101).

Almost surely, 2^161583438 is an apocalyptic number.

161583438 is an abundant number, since it is smaller than the sum of its proper divisors (161810178).

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

161583438 is a wasteful number, since it uses less digits than its factorization.

161583438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18899.

The product of its digits is 69120, while the sum is 39.

The square root of 161583438 is about 12711.5474274378. The cubic root of 161583438 is about 544.6685277813.

The spelling of 161583438 in words is "one hundred sixty-one million, five hundred eighty-three thousand, four hundred thirty-eight".