3987830 has 32 divisors (see below), whose sum is σ = 8951040. Its totient is φ = 1242720.

The previous prime is 3987829. The next prime is 3987833. The reversal of 3987830 is 387893.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1820 + ... + 3359.

It is an arithmetic number, because the mean of its divisors is an integer number (279720).

Almost surely, 2^3987830 is an apocalyptic number.

3987830 is an abundant number, since it is smaller than the sum of its proper divisors (4963210).

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

3987830 is a wasteful number, since it uses less digits than its factorization.

3987830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5204.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 3987830 is about 1996.9551822712. The cubic root of 3987830 is about 158.5789527273.

It can be divided in two parts, 398 and 7830, that added together give a palindrome (8228).

The spelling of 3987830 in words is "three million, nine hundred eighty-seven thousand, eight hundred thirty".