1397881807 has 8 divisors (see below), whose sum is σ = 1599199232. Its totient is φ = 1196969400.

The previous prime is 1397881783. The next prime is 1397881817. The reversal of 1397881807 is 7081887931.

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

It is a cyclic number.

It is not a de Polignac number, because 1397881807 - 2⁷ = 1397881679 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 (1397881817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93819 + ... + 107692.

It is an arithmetic number, because the mean of its divisors is an integer number (199899904).

Almost surely, 2^1397881807 is an apocalyptic number.

1397881807 is a deficient number, since it is larger than the sum of its proper divisors (201317425).

1397881807 is an equidigital number, since it uses as much as digits as its factorization.

1397881807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202509.

The product of its (nonzero) digits is 677376, while the sum is 52.

The square root of 1397881807 is about 37388.2576085059. The cubic root of 1397881807 is about 1118.1244670443.

The spelling of 1397881807 in words is "one billion, three hundred ninety-seven million, eight hundred eighty-one thousand, eight hundred seven".