3861890 has 16 divisors (see below), whose sum is σ = 7360632. Its totient is φ = 1453824.

The previous prime is 3861889. The next prime is 3861899. The reversal of 3861890 is 981683.

It can be written as a sum of positive squares in 4 ways, for example, as 3279721 + 582169 = 1811^2 + 763^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3861890.

It is not an unprimeable number, because it can be changed into a prime (3861899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11189 + ... + 11528.

Almost surely, 2^3861890 is an apocalyptic number.

3861890 is a deficient number, since it is larger than the sum of its proper divisors (3498742).

3861890 is a wasteful number, since it uses less digits than its factorization.

3861890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22741.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 3861890 is about 1965.1692039110. The cubic root of 3861890 is about 156.8916991477.

The spelling of 3861890 in words is "three million, eight hundred sixty-one thousand, eight hundred ninety".