1999457 has 4 divisors (see below), whose sum is σ = 2046000. Its totient is φ = 1952916.

The previous prime is 1999441. The next prime is 1999471. The reversal of 1999457 is 7549991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1999457 - 2⁴ = 1999441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999957) 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, 23207 + ... + 23292.

It is an arithmetic number, because the mean of its divisors is an integer number (511500).

2^1999457 is an apocalyptic number.

It is an amenable number.

1999457 is a deficient number, since it is larger than the sum of its proper divisors (46543).

1999457 is an equidigital number, since it uses as much as digits as its factorization.

1999457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46542.

The product of its digits is 102060, while the sum is 44.

The square root of 1999457 is about 1414.0215698496. The cubic root of 1999457 is about 125.9807016719.

The spelling of 1999457 in words is "one million, nine hundred ninety-nine thousand, four hundred fifty-seven".