399826801 has 4 divisors (see below), whose sum is σ = 436174704. Its totient is φ = 363478900.

The previous prime is 399826783. The next prime is 399826807. The reversal of 399826801 is 108628993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399826801 - 2⁷ = 399826673 is a prime.

It is a super-2 number, since 2×399826801² = 319722941595787202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399826807) 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 3 ways as a sum of consecutive naturals, for example, 18173935 + ... + 18173956.

It is an arithmetic number, because the mean of its divisors is an integer number (109043676).

Almost surely, 2^399826801 is an apocalyptic number.

It is an amenable number.

399826801 is a deficient number, since it is larger than the sum of its proper divisors (36347903).

399826801 is a wasteful number, since it uses less digits than its factorization.

399826801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36347902.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 399826801 is about 19995.6695561814. The cubic root of 399826801 is about 736.6999392801.

The spelling of 399826801 in words is "three hundred ninety-nine million, eight hundred twenty-six thousand, eight hundred one".