3978073987 has 4 divisors (see below), whose sum is σ = 4008441096. Its totient is φ = 3947706880.

The previous prime is 3978073961. The next prime is 3978073991. The reversal of 3978073987 is 7893708793.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3978073987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3978073087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15183358 + ... + 15183619.

It is an arithmetic number, because the mean of its divisors is an integer number (1002110274).

Almost surely, 2^3978073987 is an apocalyptic number.

3978073987 is a deficient number, since it is larger than the sum of its proper divisors (30367109).

3978073987 is a wasteful number, since it uses less digits than its factorization.

3978073987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30367108.

The product of its (nonzero) digits is 16003008, while the sum is 61.

The square root of 3978073987 is about 63071.9746559437. The cubic root of 3978073987 is about 1584.4952881567.

The spelling of 3978073987 in words is "three billion, nine hundred seventy-eight million, seventy-three thousand, nine hundred eighty-seven".