3987942 has 16 divisors (see below), whose sum is σ = 9115392. Its totient is φ = 1139400.

The previous prime is 3987937. The next prime is 3987943. The reversal of 3987942 is 2497893.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 94951 = 3987942 / (3 + 9 + 8 + 7 + 9 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 3987894 and 3987903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47434 + ... + 47517.

It is an arithmetic number, because the mean of its divisors is an integer number (569712).

Almost surely, 2^3987942 is an apocalyptic number.

3987942 is an abundant number, since it is smaller than the sum of its proper divisors (5127450).

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

3987942 is a wasteful number, since it uses less digits than its factorization.

3987942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94963.

The product of its digits is 108864, while the sum is 42.

The square root of 3987942 is about 1996.9832247668. The cubic root of 3987942 is about 158.5804373005.

The spelling of 3987942 in words is "three million, nine hundred eighty-seven thousand, nine hundred forty-two".