4000778 has 4 divisors (see below), whose sum is σ = 6001170. Its totient is φ = 2000388.

The previous prime is 4000751. The next prime is 4000813. The reversal of 4000778 is 8770004.

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., 3988009 + 12769 = 1997^2 + 113^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000193 + ... + 1000196.

Almost surely, 2^4000778 is an apocalyptic number.

4000778 is a deficient number, since it is larger than the sum of its proper divisors (2000392).

4000778 is a wasteful number, since it uses less digits than its factorization.

4000778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000391.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 4000778 is about 2000.1944905434. The cubic root of 4000778 is about 158.7503961798.

The spelling of 4000778 in words is "four million, seven hundred seventy-eight", and thus it is an aban number.