3881690 has 8 divisors (see below), whose sum is σ = 6987060. Its totient is φ = 1552672.

The previous prime is 3881671. The next prime is 3881699. The reversal of 3881690 is 961883.

It can be written as a sum of positive squares in 2 ways, for example, as 3575881 + 305809 = 1891^2 + 553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×3881690² = 30135034512200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3881690.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3881699) 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, 194075 + ... + 194094.

Almost surely, 2^3881690 is an apocalyptic number.

3881690 is a deficient number, since it is larger than the sum of its proper divisors (3105370).

3881690 is a wasteful number, since it uses less digits than its factorization.

3881690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388176.

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

The square root of 3881690 is about 1970.2004974114. The cubic root of 3881690 is about 157.1593713459.

The spelling of 3881690 in words is "three million, eight hundred eighty-one thousand, six hundred ninety".