3913987 has 12 divisors (see below), whose sum is σ = 4917808. Its totient is φ = 3049200.

The previous prime is 3913969. The next prime is 3913991. The reversal of 3913987 is 7893193.

It is not a de Polignac number, because 3913987 - 2¹¹ = 3911939 is a prime.

3913987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3913907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1464 + ... + 3157.

Almost surely, 2^3913987 is an apocalyptic number.

3913987 is a deficient number, since it is larger than the sum of its proper divisors (1003821).

3913987 is a wasteful number, since it uses less digits than its factorization.

3913987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4650 (or 4639 counting only the distinct ones).

The product of its digits is 40824, while the sum is 40.

The square root of 3913987 is about 1978.3798927405. The cubic root of 3913987 is about 157.5940414274.

It can be divided in two parts, 3913 and 987, that added together give a square (4900 = 70²).

The spelling of 3913987 in words is "three million, nine hundred thirteen thousand, nine hundred eighty-seven".