3994140 has 24 divisors (see below), whose sum is σ = 11183760. Its totient is φ = 1065088.

The previous prime is 3994121. The next prime is 3994147. The reversal of 3994140 is 414993.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 3994098 and 3994107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33225 + ... + 33344.

It is an arithmetic number, because the mean of its divisors is an integer number (465990).

Almost surely, 2^3994140 is an apocalyptic number.

3994140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3994140 is an abundant number, since it is smaller than the sum of its proper divisors (7189620).

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

3994140 is a wasteful number, since it uses less digits than its factorization.

3994140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66581 (or 66579 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 3994140 is about 1998.5344630504. The cubic root of 3994140 is about 158.6625492266.

The spelling of 3994140 in words is "three million, nine hundred ninety-four thousand, one hundred forty".