3881290 has 36 divisors (see below), whose sum is σ = 8219286. Its totient is φ = 1315776.

The previous prime is 3881249. The next prime is 3881291. The reversal of 3881290 is 921883.

It can be written as a sum of positive squares in 3 ways, for example, as 1901641 + 1979649 = 1379^2 + 1407^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (3881291) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 43566 + ... + 43654.

Almost surely, 2^3881290 is an apocalyptic number.

3881290 is an abundant number, since it is smaller than the sum of its proper divisors (4337996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3881290 is an equidigital number, since it uses as much as digits as its factorization.

3881290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 3881290 is about 1970.0989822849. The cubic root of 3881290 is about 157.1539728461.

The spelling of 3881290 in words is "three million, eight hundred eighty-one thousand, two hundred ninety".