7981989 has 16 divisors (see below), whose sum is σ = 11491200. Its totient is φ = 4913216.

The previous prime is 7981949. The next prime is 7981999. The reversal of 7981989 is 9891897.

It is a cyclic number.

It is not a de Polignac number, because 7981989 - 2¹⁷ = 7850917 is a prime.

It is a super-2 number, since 2×7981989² = 127424296792242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981949) 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, 7 + ... + 3995.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^7981989 is an apocalyptic number.

It is an amenable number.

7981989 is a deficient number, since it is larger than the sum of its proper divisors (3509211).

7981989 is a wasteful number, since it uses less digits than its factorization.

7981989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044.

The product of its digits is 326592, while the sum is 51.

The square root of 7981989 is about 2825.2414056147. The cubic root of 7981989 is about 199.8497955547.

The spelling of 7981989 in words is "seven million, nine hundred eighty-one thousand, nine hundred eighty-nine".