7997642 has 4 divisors (see below), whose sum is σ = 11996466. Its totient is φ = 3998820.

The previous prime is 7997623. The next prime is 7997663. The reversal of 7997642 is 2467997.

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

It can be written as a sum of positive squares in only one way, i.e., 7958041 + 39601 = 2821^2 + 199^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7997593 and 7997602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999409 + ... + 1999412.

Almost surely, 2^7997642 is an apocalyptic number.

7997642 is a deficient number, since it is larger than the sum of its proper divisors (3998824).

7997642 is a wasteful number, since it uses less digits than its factorization.

7997642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998823.

The product of its digits is 190512, while the sum is 44.

The square root of 7997642 is about 2828.0102545783. The cubic root of 7997642 is about 199.9803480691.

The spelling of 7997642 in words is "seven million, nine hundred ninety-seven thousand, six hundred forty-two".