1309661394 has 8 divisors (see below), whose sum is σ = 2619322800. Its totient is φ = 436553796.

The previous prime is 1309661369. The next prime is 1309661407. The reversal of 1309661394 is 4931669031.

It is a sphenic number, since it is the product of 3 distinct primes.

1309661394 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109138444 + ... + 109138455.

It is an arithmetic number, because the mean of its divisors is an integer number (327415350).

Almost surely, 2^1309661394 is an apocalyptic number.

1309661394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1309661394 is a wasteful number, since it uses less digits than its factorization.

1309661394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218276904.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 1309661394 is about 36189.2441755834. The cubic root of 1309661394 is about 1094.0898991103.

The spelling of 1309661394 in words is "one billion, three hundred nine million, six hundred sixty-one thousand, three hundred ninety-four".