7840989 has 32 divisors (see below), whose sum is σ = 12700800. Its totient is φ = 4752000.

The previous prime is 7840981. The next prime is 7840997. The reversal of 7840989 is 9890487.

It is an interprime number because it is at equal distance from previous prime (7840981) and next prime (7840997).

It is not a de Polignac number, because 7840989 - 2³ = 7840981 is a prime.

It is a super-2 number, since 2×7840989² = 122962216996242, which contains 22 as substring.

7840989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7840981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31114 + ... + 31364.

It is an arithmetic number, because the mean of its divisors is an integer number (396900).

Almost surely, 2^7840989 is an apocalyptic number.

It is an amenable number.

7840989 is a deficient number, since it is larger than the sum of its proper divisors (4859811).

7840989 is a wasteful number, since it uses less digits than its factorization.

7840989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 7840989 is about 2800.1766015736. The cubic root of 7840989 is about 198.6660307448. Note that the first 3 decimals are identical.

The spelling of 7840989 in words is "seven million, eight hundred forty thousand, nine hundred eighty-nine".