1900989 has 12 divisors (see below), whose sum is σ = 2847936. Its totient is φ = 1267164.

The previous prime is 1900981. The next prime is 1901021. The reversal of 1900989 is 9890091.

It is not a de Polignac number, because 1900989 - 2³ = 1900981 is a prime.

It is a super-2 number, since 2×1900989² = 7227518356242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3669 + ... + 4154.

It is an arithmetic number, because the mean of its divisors is an integer number (237328).

2^1900989 is an apocalyptic number.

It is an amenable number.

1900989 is a deficient number, since it is larger than the sum of its proper divisors (946947).

1900989 is an frugal number, since it uses more digits than its factorization.

1900989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7838 (or 7826 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1900989 is about 1378.7635765424. The cubic root of 1900989 is about 123.8777193782.

The spelling of 1900989 in words is "one million, nine hundred thousand, nine hundred eighty-nine".