1309240772 has 24 divisors (see below), whose sum is σ = 2651631360. Its totient is φ = 553999680.

The previous prime is 1309240727. The next prime is 1309240787. The reversal of 1309240772 is 2770429031.

It is a super-2 number, since 2×1309240772² = 3428222798134311968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293729 + ... + 298152.

It is an arithmetic number, because the mean of its divisors is an integer number (110484640).

Almost surely, 2^1309240772 is an apocalyptic number.

It is an amenable number.

1309240772 is an abundant number, since it is smaller than the sum of its proper divisors (1342390588).

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

1309240772 is a wasteful number, since it uses less digits than its factorization.

1309240772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591971 (or 591969 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 1309240772 is about 36183.4322860615. The cubic root of 1309240772 is about 1093.9727574940.

The spelling of 1309240772 in words is "one billion, three hundred nine million, two hundred forty thousand, seven hundred seventy-two".