1309187952 has 60 divisors (see below), whose sum is σ = 3879439200. Its totient is φ = 410724864.

The previous prime is 1309187941. The next prime is 1309188007. The reversal of 1309187952 is 2597819031.

It is a junction number, because it is equal to n+sod(n) for n = 1309187898 and 1309187907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264952 + ... + 269847.

It is an arithmetic number, because the mean of its divisors is an integer number (64657320).

Almost surely, 2^1309187952 is an apocalyptic number.

1309187952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1309187952 is an abundant number, since it is smaller than the sum of its proper divisors (2570251248).

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

1309187952 is a wasteful number, since it uses less digits than its factorization.

1309187952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534830 (or 534821 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1309187952 is about 36182.7023866377. The cubic root of 1309187952 is about 1093.9580455532.

The spelling of 1309187952 in words is "one billion, three hundred nine million, one hundred eighty-seven thousand, nine hundred fifty-two".