261937230 has 64 divisors (see below), whose sum is σ = 666178560. Its totient is φ = 65729664.

The previous prime is 261937229. The next prime is 261937231. The reversal of 261937230 is 32739162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261937229) and next prime (261937231).

It is a super-2 number, since 2×261937230² = 137222224920145800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261937191 and 261937200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261937231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88027 + ... + 90953.

It is an arithmetic number, because the mean of its divisors is an integer number (10409040).

Almost surely, 2^261937230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261937230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333089280).

261937230 is an abundant number, since it is smaller than the sum of its proper divisors (404241330).

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

261937230 is a wasteful number, since it uses less digits than its factorization.

261937230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 261937230 is about 16184.4749683145. The cubic root of 261937230 is about 639.8316858820.

The spelling of 261937230 in words is "two hundred sixty-one million, nine hundred thirty-seven thousand, two hundred thirty".