7890961 has 4 divisors (see below), whose sum is σ = 8497972. Its totient is φ = 7283952.

The previous prime is 7890959. The next prime is 7890979. The reversal of 7890961 is 1690987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1690987 = 251 ⋅6737.

It can be written as a sum of positive squares in 2 ways, for example, as 4596736 + 3294225 = 2144^2 + 1815^2 .

It is not a de Polignac number, because 7890961 - 2¹ = 7890959 is a prime.

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

It is a Duffinian number.

7890961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7890991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303486 + ... + 303511.

It is an arithmetic number, because the mean of its divisors is an integer number (2124493).

Almost surely, 2^7890961 is an apocalyptic number.

It is an amenable number.

7890961 is a deficient number, since it is larger than the sum of its proper divisors (607011).

7890961 is a wasteful number, since it uses less digits than its factorization.

7890961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607010.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 7890961 is about 2809.0854383589. The cubic root of 7890961 is about 199.0871818198.

The spelling of 7890961 in words is "seven million, eight hundred ninety thousand, nine hundred sixty-one".