3987512906 has 32 divisors (see below), whose sum is σ = 6549287808. Its totient is φ = 1809656640.

The previous prime is 3987512897. The next prime is 3987512923. The reversal of 3987512906 is 6092157893.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1149731 + ... + 1153193.

It is an arithmetic number, because the mean of its divisors is an integer number (204665244).

Almost surely, 2^3987512906 is an apocalyptic number.

3987512906 is a deficient number, since it is larger than the sum of its proper divisors (2561774902).

3987512906 is a wasteful number, since it uses less digits than its factorization.

3987512906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 3987512906 is about 63146.7568921793. The cubic root of 3987512906 is about 1585.7474945828.

The spelling of 3987512906 in words is "three billion, nine hundred eighty-seven million, five hundred twelve thousand, nine hundred six".