261493992 has 48 divisors (see below), whose sum is σ = 739009440. Its totient is φ = 83374368.

The previous prime is 261493951. The next prime is 261493993. The reversal of 261493992 is 299394162.

It is a happy number.

261493992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261493993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77298 + ... + 80609.

It is an arithmetic number, because the mean of its divisors is an integer number (15396030).

Almost surely, 2^261493992 is an apocalyptic number.

It is an amenable number.

261493992 is an abundant number, since it is smaller than the sum of its proper divisors (477515448).

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

261493992 is a wasteful number, since it uses less digits than its factorization.

261493992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157942 (or 157935 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 261493992 is about 16170.7758626480. The cubic root of 261493992 is about 639.4705843172.

The spelling of 261493992 in words is "two hundred sixty-one million, four hundred ninety-three thousand, nine hundred ninety-two".