3987031 has 4 divisors (see below), whose sum is σ = 4062312. Its totient is φ = 3911752.

The previous prime is 3987029. The next prime is 3987037. The reversal of 3987031 is 1307893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3987031 - 2¹ = 3987029 is a prime.

It is a super-2 number, since 2×3987031² = 31792832389922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

3987031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3986984 and 3987002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37561 + ... + 37666.

It is an arithmetic number, because the mean of its divisors is an integer number (1015578).

Almost surely, 2^3987031 is an apocalyptic number.

3987031 is a deficient number, since it is larger than the sum of its proper divisors (75281).

3987031 is an equidigital number, since it uses as much as digits as its factorization.

3987031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75280.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 3987031 is about 1996.7551176847. The cubic root of 3987031 is about 158.5683610817.

The spelling of 3987031 in words is "three million, nine hundred eighty-seven thousand, thirty-one".