4000398491 has 8 divisors (see below), whose sum is σ = 4228569600. Its totient is φ = 3773989800.

The previous prime is 4000398473. The next prime is 4000398497. The reversal of 4000398491 is 1948930004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4000398491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4000398497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435935 + ... + 445016.

It is an arithmetic number, because the mean of its divisors is an integer number (528571200).

Almost surely, 2^4000398491 is an apocalyptic number.

4000398491 is a deficient number, since it is larger than the sum of its proper divisors (228171109).

4000398491 is a wasteful number, since it uses less digits than its factorization.

4000398491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881209.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 4000398491 is about 63248.7034728776. The cubic root of 4000398491 is about 1587.4537639705.

The spelling of 4000398491 in words is "four billion, three hundred ninety-eight thousand, four hundred ninety-one".