3906778 has 8 divisors (see below), whose sum is σ = 5914260. Its totient is φ = 1935360.

The previous prime is 3906769. The next prime is 3906779. The reversal of 3906778 is 8776093.

It can be written as a sum of positive squares in 2 ways, for example, as 3697929 + 208849 = 1923^2 + 457^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 3906778.

It is not an unprimeable number, because it can be changed into a prime (3906779) 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, 8743 + ... + 9178.

Almost surely, 2^3906778 is an apocalyptic number.

3906778 is a deficient number, since it is larger than the sum of its proper divisors (2007482).

3906778 is a wasteful number, since it uses less digits than its factorization.

3906778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18032.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 3906778 is about 1976.5571077002. The cubic root of 3906778 is about 157.4972267925.

The spelling of 3906778 in words is "three million, nine hundred six thousand, seven hundred seventy-eight".