1261690742 has 32 divisors (see below), whose sum is σ = 2058244608. Its totient is φ = 576598176.

The previous prime is 1261690739. The next prime is 1261690757. The reversal of 1261690742 is 2470961621.

It is a junction number, because it is equal to n+sod(n) for n = 1261690696 and 1261690705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1961873 + ... + 1962515.

It is an arithmetic number, because the mean of its divisors is an integer number (64320144).

Almost surely, 2^1261690742 is an apocalyptic number.

1261690742 is a deficient number, since it is larger than the sum of its proper divisors (796553866).

1261690742 is a wasteful number, since it uses less digits than its factorization.

1261690742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1261690742 is about 35520.2863445665. The cubic root of 1261690742 is about 1080.5651882833.

The spelling of 1261690742 in words is "one billion, two hundred sixty-one million, six hundred ninety thousand, seven hundred forty-two".