3942784 has 16 divisors (see below), whose sum is σ = 7855020. Its totient is φ = 1971328.

The previous prime is 3942781. The next prime is 3942839. The reversal of 3942784 is 4872493.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3942781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15274 + ... + 15529.

Almost surely, 2^3942784 is an apocalyptic number.

It is an amenable number.

3942784 is a deficient number, since it is larger than the sum of its proper divisors (3912236).

3942784 is an equidigital number, since it uses as much as digits as its factorization.

3942784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30817 (or 30805 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 3942784 is about 1985.6444797597. The cubic root of 3942784 is about 157.9795946516.

The spelling of 3942784 in words is "three million, nine hundred forty-two thousand, seven hundred eighty-four".