1373508909 has 12 divisors (see below), whose sum is σ = 2047956352. Its totient is φ = 886134600.

The previous prime is 1373508893. The next prime is 1373508923. The reversal of 1373508909 is 9098053731.

It is a happy number.

1373508909 is a `hidden beast` number, since 137 + 3 + 508 + 9 + 0 + 9 = 666.

It is not a de Polignac number, because 1373508909 - 2⁴ = 1373508893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1373508949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2461207 + ... + 2461764.

Almost surely, 2^1373508909 is an apocalyptic number.

It is an amenable number.

1373508909 is a deficient number, since it is larger than the sum of its proper divisors (674447443).

1373508909 is a wasteful number, since it uses less digits than its factorization.

1373508909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923008 (or 4923005 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 1373508909 is about 37060.8811147280. The cubic root of 1373508909 is about 1111.5879415110.

The spelling of 1373508909 in words is "one billion, three hundred seventy-three million, five hundred eight thousand, nine hundred nine".