4000399851 has 16 divisors (see below), whose sum is σ = 6124744448. Its totient is φ = 2275106400.

The previous prime is 4000399847. The next prime is 4000399873. The reversal of 4000399851 is 1589930004.

It is not a de Polignac number, because 4000399851 - 2² = 4000399847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4000399841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446980 + ... + 455841.

It is an arithmetic number, because the mean of its divisors is an integer number (382796528).

Almost surely, 2^4000399851 is an apocalyptic number.

4000399851 is a deficient number, since it is larger than the sum of its proper divisors (2124344597).

4000399851 is a wasteful number, since it uses less digits than its factorization.

4000399851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903042.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 4000399851 is about 63248.7142240852. The cubic root of 4000399851 is about 1587.4539438640.

The spelling of 4000399851 in words is "four billion, three hundred ninety-nine thousand, eight hundred fifty-one".