4000278 has 16 divisors (see below), whose sum is σ = 8020656. Its totient is φ = 1330080.

The previous prime is 4000277. The next prime is 4000291. The reversal of 4000278 is 8720004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000273) 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, 3408 + ... + 4428.

It is an arithmetic number, because the mean of its divisors is an integer number (501291).

Almost surely, 2^4000278 is an apocalyptic number.

4000278 is an abundant number, since it is smaller than the sum of its proper divisors (4020378).

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

4000278 is a wasteful number, since it uses less digits than its factorization.

4000278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 4000278 is about 2000.0694987925. The cubic root of 4000278 is about 158.7437825907.

It can be divided in two parts, 4000 and 278, that added together give a triangular number (4278 = T₉₂).

The spelling of 4000278 in words is "four million, two hundred seventy-eight", and thus it is an aban number.