3997890 has 128 divisors (see below), whose sum is σ = 12337920. Its totient is φ = 912384.

The previous prime is 3997871. The next prime is 3997891. The reversal of 3997890 is 987993.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 59637 + ... + 59703.

It is an arithmetic number, because the mean of its divisors is an integer number (96390).

Almost surely, 2^3997890 is an apocalyptic number.

3997890 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 3997890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6168960).

3997890 is an abundant number, since it is smaller than the sum of its proper divisors (8340030).

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

3997890 is a wasteful number, since it uses less digits than its factorization.

3997890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 3997890 is about 1999.4724304176. The cubic root of 3997890 is about 158.7121884857.

The spelling of 3997890 in words is "three million, nine hundred ninety-seven thousand, eight hundred ninety".