7491989 has 4 divisors (see below), whose sum is σ = 7569324. Its totient is φ = 7414656.

The previous prime is 7491973. The next prime is 7492031. The reversal of 7491989 is 9891947.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1030225 + 6461764 = 1015^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 7491989 - 2⁴ = 7491973 is a prime.

It is a super-2 number, since 2×7491989² = 112259798352242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7491929) 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 3 ways as a sum of consecutive naturals, for example, 38522 + ... + 38715.

It is an arithmetic number, because the mean of its divisors is an integer number (1892331).

Almost surely, 2^7491989 is an apocalyptic number.

It is an amenable number.

7491989 is a deficient number, since it is larger than the sum of its proper divisors (77335).

7491989 is an equidigital number, since it uses as much as digits as its factorization.

7491989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77334.

The product of its digits is 163296, while the sum is 47.

The square root of 7491989 is about 2737.1497949509. The cubic root of 7491989 is about 195.6736638861.

The spelling of 7491989 in words is "seven million, four hundred ninety-one thousand, nine hundred eighty-nine".