266431938 has 8 divisors (see below), whose sum is σ = 532863888. Its totient is φ = 88810644.

The previous prime is 266431897. The next prime is 266431987. The reversal of 266431938 is 839134662.

It is a sphenic number, since it is the product of 3 distinct primes.

266431938 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 266431938.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22202656 + ... + 22202667.

It is an arithmetic number, because the mean of its divisors is an integer number (66607986).

Almost surely, 2^266431938 is an apocalyptic number.

266431938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

266431938 is a wasteful number, since it uses less digits than its factorization.

266431938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44405328.

The product of its digits is 186624, while the sum is 42.

The square root of 266431938 is about 16322.7429680186. The cubic root of 266431938 is about 643.4706776008.

The spelling of 266431938 in words is "two hundred sixty-six million, four hundred thirty-one thousand, nine hundred thirty-eight".