261858132 has 36 divisors (see below), whose sum is σ = 677316640. Its totient is φ = 85255632.

The previous prime is 261858119. The next prime is 261858137. The reversal of 261858132 is 231858162.

It is a happy number.

261858132 is a `hidden beast` number, since 2 + 618 + 5 + 8 + 1 + 32 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261858137) 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, 83032 + ... + 86127.

Almost surely, 2^261858132 is an apocalyptic number.

It is an amenable number.

261858132 is an abundant number, since it is smaller than the sum of its proper divisors (415458508).

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

261858132 is a wasteful number, since it uses less digits than its factorization.

261858132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169212 (or 169207 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 261858132 is about 16182.0311456875. The cubic root of 261858132 is about 639.7672754102.

The spelling of 261858132 in words is "two hundred sixty-one million, eight hundred fifty-eight thousand, one hundred thirty-two".