1399537309 has 4 divisors (see below), whose sum is σ = 1408805920. Its totient is φ = 1390268700.

The previous prime is 1399537301. The next prime is 1399537313. The reversal of 1399537309 is 9037359931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1399537309 - 2³ = 1399537301 is a prime.

It is a super-2 number, since 2×1399537309² = 3917409358565922962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399537301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4634079 + ... + 4634380.

It is an arithmetic number, because the mean of its divisors is an integer number (352201480).

Almost surely, 2^1399537309 is an apocalyptic number.

It is an amenable number.

1399537309 is a deficient number, since it is larger than the sum of its proper divisors (9268611).

1399537309 is an equidigital number, since it uses as much as digits as its factorization.

1399537309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9268610.

The product of its (nonzero) digits is 688905, while the sum is 49.

The square root of 1399537309 is about 37410.3903882331. The cubic root of 1399537309 is about 1118.5656886677.

The spelling of 1399537309 in words is "one billion, three hundred ninety-nine million, five hundred thirty-seven thousand, three hundred nine".