4000836 has 24 divisors (see below), whose sum is σ = 10669120. Its totient is φ = 1143072.

The previous prime is 4000823. The next prime is 4000853. The reversal of 4000836 is 6380004.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23731 + ... + 23898.

Almost surely, 2^4000836 is an apocalyptic number.

It is an amenable number.

4000836 is an abundant number, since it is smaller than the sum of its proper divisors (6668284).

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

4000836 is a wasteful number, since it uses less digits than its factorization.

4000836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47643 (or 47641 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 4000836 is about 2000.2089890809. The cubic root of 4000836 is about 158.7511633205.

The spelling of 4000836 in words is "four million, eight hundred thirty-six", and thus it is an aban number.