261930396 has 72 divisors (see below), whose sum is σ = 756384384. Its totient is φ = 69076800.

The previous prime is 261930359. The next prime is 261930413. The reversal of 261930396 is 693039162.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4971 + ... + 23421.

Almost surely, 2^261930396 is an apocalyptic number.

261930396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261930396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378192192).

261930396 is an abundant number, since it is smaller than the sum of its proper divisors (494453988).

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

261930396 is a wasteful number, since it uses less digits than its factorization.

261930396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18491 (or 18476 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 261930396 is about 16184.2638386798. The cubic root of 261930396 is about 639.8261213838.

The spelling of 261930396 in words is "two hundred sixty-one million, nine hundred thirty thousand, three hundred ninety-six".