261307400 has 48 divisors (see below), whose sum is σ = 628503300. Its totient is φ = 100916480.

The previous prime is 261307381. The next prime is 261307411. The reversal of 261307400 is 4703162.

It can be written as a sum of positive squares in 6 ways, for example, as 121925764 + 139381636 = 11042^2 + 11806^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16727 + ... + 28326.

Almost surely, 2^261307400 is an apocalyptic number.

261307400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261307400 is an abundant number, since it is smaller than the sum of its proper divisors (367195900).

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

261307400 is a wasteful number, since it uses less digits than its factorization.

261307400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45098 (or 45089 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 261307400 is about 16165.0054129283. The cubic root of 261307400 is about 639.3184476322.

The spelling of 261307400 in words is "two hundred sixty-one million, three hundred seven thousand, four hundred".