1557998 has 16 divisors (see below), whose sum is σ = 2599296. Its totient is φ = 695520.

The previous prime is 1557991. The next prime is 1558009. The reversal of 1557998 is 8997551.

It is a happy number.

1557998 is nontrivially palindromic in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161 + ... + 1772.

It is an arithmetic number, because the mean of its divisors is an integer number (162456).

2^1557998 is an apocalyptic number.

1557998 is a deficient number, since it is larger than the sum of its proper divisors (1041298).

1557998 is a wasteful number, since it uses less digits than its factorization.

1557998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979.

The product of its digits is 113400, while the sum is 44.

The square root of 1557998 is about 1248.1979009756. The cubic root of 1557998 is about 115.9281659891.

The spelling of 1557998 in words is "one million, five hundred fifty-seven thousand, nine hundred ninety-eight".