261976407 has 32 divisors (see below), whose sum is σ = 438165504. Its totient is φ = 135256800.

The previous prime is 261976369. The next prime is 261976411. The reversal of 261976407 is 704679162.

It is not a de Polignac number, because 261976407 - 2¹⁰ = 261975383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261976447) 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, 35182 + ... + 41972.

It is an arithmetic number, because the mean of its divisors is an integer number (13692672).

Almost surely, 2^261976407 is an apocalyptic number.

261976407 is a deficient number, since it is larger than the sum of its proper divisors (176189097).

261976407 is a wasteful number, since it uses less digits than its factorization.

261976407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6979.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 261976407 is about 16185.6852496272. The cubic root of 261976407 is about 639.8635833922.

The spelling of 261976407 in words is "two hundred sixty-one million, nine hundred seventy-six thousand, four hundred seven".