7961890 has 8 divisors (see below), whose sum is σ = 14331420. Its totient is φ = 3184752.

The previous prime is 7961881. The next prime is 7961929. The reversal of 7961890 is 981697.

It can be written as a sum of positive squares in 2 ways, for example, as 7946761 + 15129 = 2819^2 + 123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a zygodrome in base 3.

It is an unprimeable number.

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, 398085 + ... + 398104.

Almost surely, 2^7961890 is an apocalyptic number.

7961890 is a deficient number, since it is larger than the sum of its proper divisors (6369530).

7961890 is a wasteful number, since it uses less digits than its factorization.

7961890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796196.

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

The square root of 7961890 is about 2821.6821224227. The cubic root of 7961890 is about 199.6819110319.

The spelling of 7961890 in words is "seven million, nine hundred sixty-one thousand, eight hundred ninety".