261837492 has 96 divisors (see below), whose sum is σ = 725243904. Its totient is φ = 71971200.

The previous prime is 261837487. The next prime is 261837509. The reversal of 261837492 is 294738162.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255942 + ... + 256962.

It is an arithmetic number, because the mean of its divisors is an integer number (7554624).

Almost surely, 2^261837492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261837492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362621952).

261837492 is an abundant number, since it is smaller than the sum of its proper divisors (463406412).

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

261837492 is a wasteful number, since it uses less digits than its factorization.

261837492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149 (or 1147 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 261837492 is about 16181.3933887042. The cubic root of 261837492 is about 639.7504658711.

The spelling of 261837492 in words is "two hundred sixty-one million, eight hundred thirty-seven thousand, four hundred ninety-two".