1598409 has 6 divisors (see below), whose sum is σ = 2308826. Its totient is φ = 1065600.

The previous prime is 1598381. The next prime is 1598447. The reversal of 1598409 is 9048951.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 558009 = 1020^2 + 747^2 .

It is not a de Polignac number, because 1598409 - 2¹⁷ = 1467337 is a prime.

It is a super-2 number, since 2×1598409² = 5109822662562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

1598409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1598449) 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, 88792 + ... + 88809.

2^1598409 is an apocalyptic number.

It is an amenable number.

1598409 is a deficient number, since it is larger than the sum of its proper divisors (710417).

1598409 is a wasteful number, since it uses less digits than its factorization.

1598409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177607 (or 177604 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1598409 is about 1264.2820096798. The cubic root of 1598409 is about 116.9219290697.

The spelling of 1598409 in words is "one million, five hundred ninety-eight thousand, four hundred nine".