4001378 has 4 divisors (see below), whose sum is σ = 6002070. Its totient is φ = 2000688.

The previous prime is 4001369. The next prime is 4001383. The reversal of 4001378 is 8731004.

It is a happy number.

4001378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 2380849 + 1620529 = 1543^2 + 1273^2 .

It is a super-2 number, since 2×4001378² = 32022051797768, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000343 + ... + 1000346.

Almost surely, 2^4001378 is an apocalyptic number.

4001378 is a deficient number, since it is larger than the sum of its proper divisors (2000692).

4001378 is a wasteful number, since it uses less digits than its factorization.

4001378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000691.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 4001378 is about 2000.3444703350. The cubic root of 4001378 is about 158.7583317594.

The spelling of 4001378 in words is "four million, one thousand, three hundred seventy-eight".