161038840 has 32 divisors (see below), whose sum is σ = 363216960. Its totient is φ = 64259200.

The previous prime is 161038817. The next prime is 161038849. The reversal of 161038840 is 48830161.

It is a super-3 number, since 3×161038840³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161038849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12570 + ... + 21910.

It is an arithmetic number, because the mean of its divisors is an integer number (11350530).

Almost surely, 2^161038840 is an apocalyptic number.

161038840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161038840 is an abundant number, since it is smaller than the sum of its proper divisors (202178120).

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

161038840 is a wasteful number, since it uses less digits than its factorization.

161038840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9783 (or 9779 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 161038840 is about 12690.1079585636. The cubic root of 161038840 is about 544.0559252626.

The spelling of 161038840 in words is "one hundred sixty-one million, thirty-eight thousand, eight hundred forty".