3949885 has 4 divisors (see below), whose sum is σ = 4739868. Its totient is φ = 3159904.

The previous prime is 3949877. The next prime is 3949889. The reversal of 3949885 is 5889493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5889493 = 137 ⋅42989.

It can be written as a sum of positive squares in 2 ways, for example, as 777924 + 3171961 = 882^2 + 1781^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949885 - 2³ = 3949877 is a prime.

It is a Duffinian number.

3949885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3949889) 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, 394984 + ... + 394993.

It is an arithmetic number, because the mean of its divisors is an integer number (1184967).

Almost surely, 2^3949885 is an apocalyptic number.

It is an amenable number.

3949885 is a deficient number, since it is larger than the sum of its proper divisors (789983).

3949885 is an equidigital number, since it uses as much as digits as its factorization.

3949885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789982.

The product of its digits is 311040, while the sum is 46.

The square root of 3949885 is about 1987.4317598348. The cubic root of 3949885 is about 158.0743788031.

The spelling of 3949885 in words is "three million, nine hundred forty-nine thousand, eight hundred eighty-five".