131878404 has 54 divisors (see below), whose sum is σ = 387790494. Its totient is φ = 37679040.

The previous prime is 131878349. The next prime is 131878441. The reversal of 131878404 is 404878131.

It can be written as a sum of positive squares in only one way, i.e., 101606400 + 30272004 = 10080^2 + 5502^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 35617 + ... + 39144.

Almost surely, 2^131878404 is an apocalyptic number.

131878404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

131878404 is an abundant number, since it is smaller than the sum of its proper divisors (255912090).

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

131878404 is a wasteful number, since it uses less digits than its factorization.

131878404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74785 (or 74773 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 131878404 is about 11483.8322871766. The cubic root of 131878404 is about 509.0079446243.

The spelling of 131878404 in words is "one hundred thirty-one million, eight hundred seventy-eight thousand, four hundred four".