901989 has 16 divisors (see below), whose sum is σ = 1458240. Its totient is φ = 546480.

The previous prime is 901973. The next prime is 901993. The reversal of 901989 is 989109.

It is not a de Polignac number, because 901989 - 2⁴ = 901973 is a prime.

It is a super-2 number, since 2×901989² = 1627168312242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901909) 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 15 ways as a sum of consecutive naturals, for example, 1222 + ... + 1815.

It is an arithmetic number, because the mean of its divisors is an integer number (91140).

2⁹⁰¹⁹⁸⁹ is an apocalyptic number.

901989 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

901989 is a deficient number, since it is larger than the sum of its proper divisors (556251).

901989 is a wasteful number, since it uses less digits than its factorization.

901989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057 (or 3051 counting only the distinct ones).

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

The square root of 901989 is about 949.7310145510. The cubic root of 901989 is about 96.6200105145.

The spelling of 901989 in words is "nine hundred one thousand, nine hundred eighty-nine".