3981487 has 4 divisors (see below), whose sum is σ = 3993120. Its totient is φ = 3969856.

The previous prime is 3981479. The next prime is 3981491. The reversal of 3981487 is 7841893.

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 3981487 - 2³ = 3981479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981407) 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, 5287 + ... + 5992.

It is an arithmetic number, because the mean of its divisors is an integer number (998280).

Almost surely, 2^3981487 is an apocalyptic number.

3981487 is a deficient number, since it is larger than the sum of its proper divisors (11633).

3981487 is a wasteful number, since it uses less digits than its factorization.

3981487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11632.

The product of its digits is 48384, while the sum is 40.

The square root of 3981487 is about 1995.3663823970. The cubic root of 3981487 is about 158.4948301113.

The spelling of 3981487 in words is "three million, nine hundred eighty-one thousand, four hundred eighty-seven".