1903989 has 16 divisors (see below), whose sum is σ = 2672640. Its totient is φ = 1204080.

The previous prime is 1903987. The next prime is 1903991. The reversal of 1903989 is 9893091.

It is an interprime number because it is at equal distance from previous prime (1903987) and next prime (1903991).

It is not a de Polignac number, because 1903989 - 2¹ = 1903987 is a prime.

It is a super-2 number, since 2×1903989² = 7250348224242, which contains 22 as substring.

1903989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1903981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5314 + ... + 5660.

It is an arithmetic number, because the mean of its divisors is an integer number (167040).

2^1903989 is an apocalyptic number.

It is an amenable number.

1903989 is a deficient number, since it is larger than the sum of its proper divisors (768651).

1903989 is a wasteful number, since it uses less digits than its factorization.

1903989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1903989 is about 1379.8510789212. The cubic root of 1903989 is about 123.9428500084.

The spelling of 1903989 in words is "one million, nine hundred three thousand, nine hundred eighty-nine".