1900997 has 4 divisors (see below), whose sum is σ = 2172576. Its totient is φ = 1629420.

The previous prime is 1900981. The next prime is 1901021. The reversal of 1900997 is 7990091.

It is a happy number.

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 1900997 - 2⁴ = 1900981 is a prime.

It is a super-2 number, since 2×1900997² = 7227579188018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900907) 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, 135779 + ... + 135792.

It is an arithmetic number, because the mean of its divisors is an integer number (543144).

2^1900997 is an apocalyptic number.

It is an amenable number.

1900997 is a deficient number, since it is larger than the sum of its proper divisors (271579).

1900997 is an equidigital number, since it uses as much as digits as its factorization.

1900997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271578.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 1900997 is about 1378.7664776894. The cubic root of 1900997 is about 123.8778931510.

The spelling of 1900997 in words is "one million, nine hundred thousand, nine hundred ninety-seven".