3921960987 has 48 divisors (see below), whose sum is σ = 6566676480. Its totient is φ = 2209372416.

The previous prime is 3921960967. The next prime is 3921961003. The reversal of 3921960987 is 7890691293.

3921960987 is a `hidden beast` number, since 3 + 9 + 21 + 9 + 609 + 8 + 7 = 666.

It is not a de Polignac number, because 3921960987 - 2¹⁰ = 3921959963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3921960967) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1501939 + ... + 1504547.

It is an arithmetic number, because the mean of its divisors is an integer number (136805760).

Almost surely, 2^3921960987 is an apocalyptic number.

3921960987 is a deficient number, since it is larger than the sum of its proper divisors (2644715493).

3921960987 is a wasteful number, since it uses less digits than its factorization.

3921960987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 3921960987 is about 62625.5617699354. The cubic root of 3921960987 is about 1577.0099122968.

The spelling of 3921960987 in words is "three billion, nine hundred twenty-one million, nine hundred sixty thousand, nine hundred eighty-seven".