1398297591 has 12 divisors (see below), whose sum is σ = 2020149768. Its totient is φ = 932019984.

The previous prime is 1398297577. The next prime is 1398297613. The reversal of 1398297591 is 1957928931.

It is not a de Polignac number, because 1398297591 - 2¹⁴ = 1398281207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398297391) 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, 49381 + ... + 72353.

It is an arithmetic number, because the mean of its divisors is an integer number (168345814).

Almost surely, 2^1398297591 is an apocalyptic number.

1398297591 is a deficient number, since it is larger than the sum of its proper divisors (621852177).

1398297591 is a wasteful number, since it uses less digits than its factorization.

1398297591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29742 (or 29739 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 1398297591 is about 37393.8175504989. The cubic root of 1398297591 is about 1118.2353138450.

The spelling of 1398297591 in words is "one billion, three hundred ninety-eight million, two hundred ninety-seven thousand, five hundred ninety-one".