1261807379 has 18 divisors (see below), whose sum is σ = 1484951004. Its totient is φ = 1069068000.

The previous prime is 1261807343. The next prime is 1261807397. The reversal of 1261807379 is 9737081621.

It is a de Polignac number, because none of the positive numbers 2^k-1261807379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261807319) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 386504 + ... + 389754.

It is an arithmetic number, because the mean of its divisors is an integer number (82497278).

Almost surely, 2^1261807379 is an apocalyptic number.

1261807379 is a deficient number, since it is larger than the sum of its proper divisors (223143625).

1261807379 is an frugal number, since it uses more digits than its factorization.

1261807379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443 (or 3347 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 1261807379 is about 35521.9281430499. The cubic root of 1261807379 is about 1080.5984848734.

The spelling of 1261807379 in words is "one billion, two hundred sixty-one million, eight hundred seven thousand, three hundred seventy-nine".