7961987 has 8 divisors (see below), whose sum is σ = 8709120. Its totient is φ = 7218760.

The previous prime is 7961981. The next prime is 7961999. The reversal of 7961987 is 7891697.

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

It is a cyclic number.

It is not a de Polignac number, because 7961987 - 2²² = 3767683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7961981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4814 + ... + 6252.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^7961987 is an apocalyptic number.

7961987 is a deficient number, since it is larger than the sum of its proper divisors (747133).

7961987 is a wasteful number, since it uses less digits than its factorization.

7961987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953.

The product of its digits is 190512, while the sum is 47.

The square root of 7961987 is about 2821.6993106991. The cubic root of 7961987 is about 199.6827219393.

The spelling of 7961987 in words is "seven million, nine hundred sixty-one thousand, nine hundred eighty-seven".