3998890 has 24 divisors (see below), whose sum is σ = 8374212. Its totient is φ = 1370880.

The previous prime is 3998881. The next prime is 3998899. The reversal of 3998890 is 988993.

It is an interprime number because it is at equal distance from previous prime (3998881) and next prime (3998899).

It can be written as a sum of positive squares in 2 ways, for example, as 3924361 + 74529 = 1981^2 + 273^2 .

It is a super-2 number, since 2×3998890² = 31982242464200, 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 3998890.

It is not an unprimeable number, because it can be changed into a prime (3998899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3591 + ... + 4570.

Almost surely, 2^3998890 is an apocalyptic number.

3998890 is an abundant number, since it is smaller than the sum of its proper divisors (4375322).

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

3998890 is a wasteful number, since it uses less digits than its factorization.

3998890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8182 (or 8175 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 3998890 is about 1999.7224807458. The cubic root of 3998890 is about 158.7254203787.

The spelling of 3998890 in words is "three million, nine hundred ninety-eight thousand, eight hundred ninety".