26431956 has 18 divisors (see below), whose sum is σ = 66814202. Its totient is φ = 8810640.

The previous prime is 26431939. The next prime is 26431987. The reversal of 26431956 is 65913462.

It is a happy number.

26431956 is a `hidden beast` number, since 2 + 643 + 1 + 9 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21068100 + 5363856 = 4590^2 + 2316^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 734221 = 26431956 / (2 + 6 + 4 + 3 + 1 + 9 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 26431956.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 367075 + ... + 367146.

Almost surely, 2^26431956 is an apocalyptic number.

It is an amenable number.

26431956 is an abundant number, since it is smaller than the sum of its proper divisors (40382246).

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

26431956 is a wasteful number, since it uses less digits than its factorization.

26431956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734231 (or 734226 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 26431956 is about 5141.2018050257. The cubic root of 26431956 is about 297.8812042444.

The spelling of 26431956 in words is "twenty-six million, four hundred thirty-one thousand, nine hundred fifty-six".