3988890 has 96 divisors (see below), whose sum is σ = 11321856. Its totient is φ = 971520.

The previous prime is 3988889. The next prime is 3988903. The reversal of 3988890 is 988893.

It is a super-2 number, since 2×3988890² = 31822486864200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84847 + ... + 84893.

It is an arithmetic number, because the mean of its divisors is an integer number (117936).

Almost surely, 2^3988890 is an apocalyptic number.

3988890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3988890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5660928).

3988890 is an abundant number, since it is smaller than the sum of its proper divisors (7332966).

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

3988890 is a wasteful number, since it uses less digits than its factorization.

3988890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 3988890 is about 1997.2205686904. The cubic root of 3988890 is about 158.5930020389.

The spelling of 3988890 in words is "three million, nine hundred eighty-eight thousand, eight hundred ninety".