261395430 has 16 divisors (see below), whose sum is σ = 627349104. Its totient is φ = 69705440.

The previous prime is 261395419. The next prime is 261395443. The reversal of 261395430 is 34593162.

It is a junction number, because it is equal to n+sod(n) for n = 261395391 and 261395400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4356561 + ... + 4356620.

It is an arithmetic number, because the mean of its divisors is an integer number (39209319).

Almost surely, 2^261395430 is an apocalyptic number.

261395430 is an abundant number, since it is smaller than the sum of its proper divisors (365953674).

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

261395430 is a wasteful number, since it uses less digits than its factorization.

261395430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713191.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 261395430 is about 16167.7280407607. The cubic root of 261395430 is about 639.3902313937.

The spelling of 261395430 in words is "two hundred sixty-one million, three hundred ninety-five thousand, four hundred thirty".