1373378809 has 4 divisors (see below), whose sum is σ = 1498231440. Its totient is φ = 1248526180.

The previous prime is 1373378807. The next prime is 1373378821. The reversal of 1373378809 is 9088733731.

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 not a de Polignac number, because 1373378809 - 2¹ = 1373378807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1373378801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62426299 + ... + 62426320.

It is an arithmetic number, because the mean of its divisors is an integer number (374557860).

Almost surely, 2^1373378809 is an apocalyptic number.

It is an amenable number.

1373378809 is a deficient number, since it is larger than the sum of its proper divisors (124852631).

1373378809 is a wasteful number, since it uses less digits than its factorization.

1373378809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124852630.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 1373378809 is about 37059.1258531553. The cubic root of 1373378809 is about 1111.5528435327.

The spelling of 1373378809 in words is "one billion, three hundred seventy-three million, three hundred seventy-eight thousand, eight hundred nine".