1990597 has 8 divisors (see below), whose sum is σ = 2288000. Its totient is φ = 1696464.

The previous prime is 1990579. The next prime is 1990607. The reversal of 1990597 is 7950991.

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

It is not a de Polignac number, because 1990597 - 2¹¹ = 1988549 is a prime.

It is a Duffinian number.

1990597 is a modest number, since divided by 597 gives 199 as remainder.

1990597 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990507) 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, 679 + ... + 2107.

It is an arithmetic number, because the mean of its divisors is an integer number (286000).

2^1990597 is an apocalyptic number.

It is an amenable number.

1990597 is a deficient number, since it is larger than the sum of its proper divisors (297403).

1990597 is a wasteful number, since it uses less digits than its factorization.

1990597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 1990597 is about 1410.8851831386. The cubic root of 1990597 is about 125.7943441135.

It can be divided in two parts, 19905 and 97, that added together give a palindrome (20002).

The spelling of 1990597 in words is "one million, nine hundred ninety thousand, five hundred ninety-seven".