3942778 has 8 divisors (see below), whose sum is σ = 6759072. Its totient is φ = 1689756.

The previous prime is 3942773. The next prime is 3942781. The reversal of 3942778 is 8772493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 3¹² + 9² + 4¹⁰ + 2¹⁷ + 7⁵ + 7⁶ + 8⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 3942778.

It is not an unprimeable number, because it can be changed into a prime (3942773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140800 + ... + 140827.

It is an arithmetic number, because the mean of its divisors is an integer number (844884).

Almost surely, 2^3942778 is an apocalyptic number.

3942778 is a deficient number, since it is larger than the sum of its proper divisors (2816294).

3942778 is a wasteful number, since it uses less digits than its factorization.

3942778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281636.

The product of its digits is 84672, while the sum is 40.

The square root of 3942778 is about 1985.6429689146. The cubic root of 3942778 is about 157.9795145155.

The spelling of 3942778 in words is "three million, nine hundred forty-two thousand, seven hundred seventy-eight".