7894989 has 20 divisors (see below), whose sum is σ = 12204060. Its totient is φ = 5080320.

The previous prime is 7894981. The next prime is 7894993. The reversal of 7894989 is 9894987.

It can be written as a sum of positive squares in 2 ways, for example, as 5062500 + 2832489 = 2250^2 + 1683^2 .

It is not a de Polignac number, because 7894989 - 2³ = 7894981 is a prime.

It is an alternating number because its digits alternate between odd and even.

Its product of digits (1306368) is a multiple of the sum of its prime factors (3402).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7894981) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 669 + ... + 4029.

It is an arithmetic number, because the mean of its divisors is an integer number (610203).

Almost surely, 2^7894989 is an apocalyptic number.

It is an amenable number.

7894989 is a deficient number, since it is larger than the sum of its proper divisors (4309071).

7894989 is a wasteful number, since it uses less digits than its factorization.

7894989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3402 (or 3393 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 7894989 is about 2809.8023062130. The cubic root of 7894989 is about 199.1210512373.

It can be divided in two parts, 789 and 4989, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 7894989 in words is "seven million, eight hundred ninety-four thousand, nine hundred eighty-nine".