1598978 has 4 divisors (see below), whose sum is σ = 2398470. Its totient is φ = 799488.

The previous prime is 1598963. The next prime is 1598999. The reversal of 1598978 is 8798951.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8798951 = 7 ⋅1256993.

It can be written as a sum of positive squares in only one way, i.e., 1456849 + 142129 = 1207^2 + 377^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399743 + ... + 399746.

2^1598978 is an apocalyptic number.

1598978 is a deficient number, since it is larger than the sum of its proper divisors (799492).

1598978 is an equidigital number, since it uses as much as digits as its factorization.

1598978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799491.

The product of its digits is 181440, while the sum is 47.

The square root of 1598978 is about 1264.5070185649. The cubic root of 1598978 is about 116.9358013400.

The spelling of 1598978 in words is "one million, five hundred ninety-eight thousand, nine hundred seventy-eight".