7947990 has 32 divisors (see below), whose sum is σ = 21195360. Its totient is φ = 2119392.

The previous prime is 7947983. The next prime is 7948019. The reversal of 7947990 is 997497.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 14449 + ... + 14988.

It is an arithmetic number, because the mean of its divisors is an integer number (662355).

Almost surely, 2^7947990 is an apocalyptic number.

7947990 is an abundant number, since it is smaller than the sum of its proper divisors (13247370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7947990 is a wasteful number, since it uses less digits than its factorization.

7947990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29453 (or 29447 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 7947990 is about 2819.2179766737. The cubic root of 7947990 is about 199.5656406761.

The spelling of 7947990 in words is "seven million, nine hundred forty-seven thousand, nine hundred ninety".