1398591 has 6 divisors (see below), whose sum is σ = 2020200. Its totient is φ = 932388.

The previous prime is 1398581. The next prime is 1398599. The reversal of 1398591 is 1958931.

It is a happy number.

It is not a de Polignac number, because 1398591 - 2⁵ = 1398559 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398599) 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, 77691 + ... + 77708.

It is an arithmetic number, because the mean of its divisors is an integer number (336700).

2^1398591 is an apocalyptic number.

1398591 is a deficient number, since it is larger than the sum of its proper divisors (621609).

1398591 is a wasteful number, since it uses less digits than its factorization.

1398591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155405 (or 155402 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1398591 is about 1182.6203955623. The cubic root of 1398591 is about 111.8313522604.

The spelling of 1398591 in words is "one million, three hundred ninety-eight thousand, five hundred ninety-one".