1990457 has 8 divisors (see below), whose sum is σ = 2288832. Its totient is φ = 1695600.

The previous prime is 1990453. The next prime is 1990463. The reversal of 1990457 is 7540991.

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

It is a cyclic number.

It is not a de Polignac number, because 1990457 - 2² = 1990453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1990453) 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, 482 + ... + 2052.

It is an arithmetic number, because the mean of its divisors is an integer number (286104).

2^1990457 is an apocalyptic number.

It is an amenable number.

1990457 is a deficient number, since it is larger than the sum of its proper divisors (298375).

1990457 is a wasteful number, since it uses less digits than its factorization.

1990457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 1990457 is about 1410.8355680234. The cubic root of 1990457 is about 125.7913949779.

The spelling of 1990457 in words is "one million, nine hundred ninety thousand, four hundred fifty-seven".