7620989 has 4 divisors (see below), whose sum is σ = 7632924. Its totient is φ = 7609056.

The previous prime is 7620979. The next prime is 7621037. The reversal of 7620989 is 9890267.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9890267 = 139 ⋅71153.

It can be written as a sum of positive squares in 2 ways, for example, as 7198489 + 422500 = 2683^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 7620989 - 2⁸ = 7620733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7620959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4952 + ... + 6305.

It is an arithmetic number, because the mean of its divisors is an integer number (1908231).

Almost surely, 2^7620989 is an apocalyptic number.

It is an amenable number.

7620989 is a deficient number, since it is larger than the sum of its proper divisors (11935).

7620989 is a wasteful number, since it uses less digits than its factorization.

7620989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11934.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 7620989 is about 2760.6138810055. The cubic root of 7620989 is about 196.7903409921.

The spelling of 7620989 in words is "seven million, six hundred twenty thousand, nine hundred eighty-nine".