261374138 has 8 divisors (see below), whose sum is σ = 396785088. Its totient is φ = 129112444.

The previous prime is 261374123. The next prime is 261374171. The reversal of 261374138 is 831473162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261374098 and 261374107.

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 3 ways as a sum of consecutive naturals, for example, 787106 + ... + 787437.

It is an arithmetic number, because the mean of its divisors is an integer number (49598136).

Almost surely, 2^261374138 is an apocalyptic number.

261374138 is a deficient number, since it is larger than the sum of its proper divisors (135410950).

261374138 is a wasteful number, since it uses less digits than its factorization.

261374138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574628.

The product of its digits is 24192, while the sum is 35.

The square root of 261374138 is about 16167.0695551173. The cubic root of 261374138 is about 639.3728703832.

The spelling of 261374138 in words is "two hundred sixty-one million, three hundred seventy-four thousand, one hundred thirty-eight".