1370809 has 6 divisors (see below), whose sum is σ = 1506890. Its totient is φ = 1246080.

The previous prime is 1370779. The next prime is 1370819. The reversal of 1370809 is 9080731.

1370809 = 348² + 349² + ... + 358².

It can be written as a sum of positive squares in only one way, i.e., 1092025 + 278784 = 1045^2 + 528^2 .

It is not a de Polignac number, because 1370809 - 2⁹ = 1370297 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1370819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5544 + ... + 5785.

2^1370809 is an apocalyptic number.

It is an amenable number.

1370809 is a deficient number, since it is larger than the sum of its proper divisors (136081).

1370809 is a wasteful number, since it uses less digits than its factorization.

1370809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11351 (or 11340 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1370809 is about 1170.8155277412. The cubic root of 1370809 is about 111.0859113593.

The spelling of 1370809 in words is "one million, three hundred seventy thousand, eight hundred nine".