1598981 has 4 divisors (see below), whose sum is σ = 1601964. Its totient is φ = 1596000.

The previous prime is 1598963. The next prime is 1598999. The reversal of 1598981 is 1898951.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1598963) and next prime (1598999).

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 410881 = 1090^2 + 641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1598981 - 2¹⁴ = 1582597 is a prime.

It is a super-2 number, since 2×1598981² = 5113480476722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1598911) 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, 440 + ... + 1841.

It is an arithmetic number, because the mean of its divisors is an integer number (400491).

2^1598981 is an apocalyptic number.

It is an amenable number.

1598981 is a deficient number, since it is larger than the sum of its proper divisors (2983).

1598981 is an equidigital number, since it uses as much as digits as its factorization.

1598981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982.

The product of its digits is 25920, while the sum is 41.

The square root of 1598981 is about 1264.5082047974. The cubic root of 1598981 is about 116.9358744715.

The spelling of 1598981 in words is "one million, five hundred ninety-eight thousand, nine hundred eighty-one".