1261679394 has 16 divisors (see below), whose sum is σ = 2610371520. Its totient is φ = 406057680.

The previous prime is 1261679381. The next prime is 1261679399. The reversal of 1261679394 is 4939761621.

It is not an unprimeable number, because it can be changed into a prime (1261679399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3625342 + ... + 3625689.

It is an arithmetic number, because the mean of its divisors is an integer number (163148220).

Almost surely, 2^1261679394 is an apocalyptic number.

1261679394 is an abundant number, since it is smaller than the sum of its proper divisors (1348692126).

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

1261679394 is a wasteful number, since it uses less digits than its factorization.

1261679394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7251065.

The product of its digits is 489888, while the sum is 48.

The square root of 1261679394 is about 35520.1266045041. The cubic root of 1261679394 is about 1080.5619486383.

The spelling of 1261679394 in words is "one billion, two hundred sixty-one million, six hundred seventy-nine thousand, three hundred ninety-four".