1597978 has 8 divisors (see below), whose sum is σ = 2421972. Its totient is φ = 790656.

The previous prime is 1597969. The next prime is 1597979. The reversal of 1597978 is 8797951.

It can be written as a sum of positive squares in 2 ways, for example, as 1595169 + 2809 = 1263^2 + 53^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1597979) 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, 3925 + ... + 4312.

2^1597978 is an apocalyptic number.

1597978 is a deficient number, since it is larger than the sum of its proper divisors (823994).

1597978 is an equidigital number, since it uses as much as digits as its factorization.

1597978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8336.

The product of its digits is 158760, while the sum is 46.

The square root of 1597978 is about 1264.1115457111. Note that the first 3 decimals coincide. The cubic root of 1597978 is about 116.9114190602.

The spelling of 1597978 in words is "one million, five hundred ninety-seven thousand, nine hundred seventy-eight".