261406377 has 24 divisors (see below), whose sum is σ = 391535040. Its totient is φ = 167862240.

The previous prime is 261406363. The next prime is 261406381. The reversal of 261406377 is 773604162.

261406377 is a `hidden beast` number, since 2 + 6 + 14 + 0 + 637 + 7 = 666.

It is not a de Polignac number, because 261406377 - 2⁴ = 261406361 is a prime.

It is a super-2 number, since 2×261406377² = 136666587872532258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261406337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141852 + ... + 143682.

It is an arithmetic number, because the mean of its divisors is an integer number (16313960).

Almost surely, 2^261406377 is an apocalyptic number.

It is an amenable number.

261406377 is a deficient number, since it is larger than the sum of its proper divisors (130128663).

261406377 is a wasteful number, since it uses less digits than its factorization.

261406377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413 (or 2410 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 261406377 is about 16168.0665820005. The cubic root of 261406377 is about 639.3991569606.

The spelling of 261406377 in words is "two hundred sixty-one million, four hundred six thousand, three hundred seventy-seven".