4001278 has 4 divisors (see below), whose sum is σ = 6001920. Its totient is φ = 2000638.

The previous prime is 4001269. The next prime is 4001303. The reversal of 4001278 is 8721004.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000318 + ... + 1000321.

It is an arithmetic number, because the mean of its divisors is an integer number (1500480).

Almost surely, 2^4001278 is an apocalyptic number.

4001278 is a deficient number, since it is larger than the sum of its proper divisors (2000642).

4001278 is a wasteful number, since it uses less digits than its factorization.

4001278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000641.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 4001278 is about 2000.3194744840. The cubic root of 4001278 is about 158.7570092179.

The spelling of 4001278 in words is "four million, one thousand, two hundred seventy-eight".