3921887 has 4 divisors (see below), whose sum is σ = 3952896. Its totient is φ = 3890880.

The previous prime is 3921881. The next prime is 3921893. The reversal of 3921887 is 7881293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7881293 = 7 ⋅1125899.

It is an interprime number because it is at equal distance from previous prime (3921881) and next prime (3921893).

It is a cyclic number.

It is not a de Polignac number, because 3921887 - 2⁶ = 3921823 is a prime.

It is a super-3 number, since 3×3921887³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3921887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921881) 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, 15314 + ... + 15567.

It is an arithmetic number, because the mean of its divisors is an integer number (988224).

Almost surely, 2^3921887 is an apocalyptic number.

3921887 is a deficient number, since it is larger than the sum of its proper divisors (31009).

3921887 is a wasteful number, since it uses less digits than its factorization.

3921887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31008.

The product of its digits is 24192, while the sum is 38.

The square root of 3921887 is about 1980.3754694502. The cubic root of 3921887 is about 157.6999995577.

The spelling of 3921887 in words is "three million, nine hundred twenty-one thousand, eight hundred eighty-seven".