1261485394 has 16 divisors (see below), whose sum is σ = 2038885632. Its totient is φ = 581909328.

The previous prime is 1261485361. The next prime is 1261485397. The reversal of 1261485394 is 4935841621.

It is a self number, because there is not a number n which added to its sum of digits gives 1261485394.

It is not an unprimeable number, because it can be changed into a prime (1261485397) 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, 39967 + ... + 64189.

It is an arithmetic number, because the mean of its divisors is an integer number (127430352).

Almost surely, 2^1261485394 is an apocalyptic number.

1261485394 is a deficient number, since it is larger than the sum of its proper divisors (777400238).

1261485394 is a wasteful number, since it uses less digits than its factorization.

1261485394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26241.

The product of its digits is 207360, while the sum is 43.

The square root of 1261485394 is about 35517.3956533978. The cubic root of 1261485394 is about 1080.5065622053.

The spelling of 1261485394 in words is "one billion, two hundred sixty-one million, four hundred eighty-five thousand, three hundred ninety-four".