3987906 has 64 divisors (see below), whose sum is σ = 9313920. Its totient is φ = 1128960.

The previous prime is 3987887. The next prime is 3987913. The reversal of 3987906 is 6097893.

3987906 = T₄₀₉ + T₄₁₀ + ... + T₄₅₁.

It is a happy number.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92721 + ... + 92763.

It is an arithmetic number, because the mean of its divisors is an integer number (145530).

Almost surely, 2^3987906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3987906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4656960).

3987906 is an abundant number, since it is smaller than the sum of its proper divisors (5326014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3987906 is a wasteful number, since it uses less digits than its factorization.

3987906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 3987906 is about 1996.9742111505. The cubic root of 3987906 is about 158.5799601193.

The spelling of 3987906 in words is "three million, nine hundred eighty-seven thousand, nine hundred six".