1598621 has 4 divisors (see below), whose sum is σ = 1609500. Its totient is φ = 1587744.

The previous prime is 1598617. The next prime is 1598633. The reversal of 1598621 is 1268951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1268951 = 317 ⋅4003.

It can be written as a sum of positive squares in 2 ways, for example, as 657721 + 940900 = 811^2 + 970^2 .

It is not a de Polignac number, because 1598621 - 2² = 1598617 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 (1598651) 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, 5216 + ... + 5513.

It is an arithmetic number, because the mean of its divisors is an integer number (402375).

2^1598621 is an apocalyptic number.

It is an amenable number.

1598621 is a deficient number, since it is larger than the sum of its proper divisors (10879).

1598621 is a wasteful number, since it uses less digits than its factorization.

1598621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10878.

The product of its digits is 4320, while the sum is 32.

The square root of 1598621 is about 1264.3658489535. The cubic root of 1598621 is about 116.9270980332.

The spelling of 1598621 in words is "one million, five hundred ninety-eight thousand, six hundred twenty-one".