131866438 has 16 divisors (see below), whose sum is σ = 219854736. Its totient is φ = 58807840.

The previous prime is 131866417. The next prime is 131866439. The reversal of 131866438 is 834668131.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 131866438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131866439) 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, 55381 + ... + 57712.

It is an arithmetic number, because the mean of its divisors is an integer number (13740921).

Almost surely, 2^131866438 is an apocalyptic number.

131866438 is a deficient number, since it is larger than the sum of its proper divisors (87988298).

131866438 is a wasteful number, since it uses less digits than its factorization.

131866438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113159.

The product of its digits is 82944, while the sum is 40.

The square root of 131866438 is about 11483.3112820301. The cubic root of 131866438 is about 508.9925491966.

The spelling of 131866438 in words is "one hundred thirty-one million, eight hundred sixty-six thousand, four hundred thirty-eight".