816439901 has 8 divisors (see below), whose sum is σ = 879419904. Its totient is φ = 755750160.

The previous prime is 816439889. The next prime is 816439919. The reversal of 816439901 is 109934618.

816439901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 816439901 - 2⁶ = 816439837 is a prime.

It is a super-2 number, since 2×816439901² = 1333148223889779602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816439201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571826 + ... + 573251.

It is an arithmetic number, because the mean of its divisors is an integer number (109927488).

Almost surely, 2^816439901 is an apocalyptic number.

It is an amenable number.

816439901 is a deficient number, since it is larger than the sum of its proper divisors (62980003).

816439901 is a wasteful number, since it uses less digits than its factorization.

816439901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145131.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 816439901 is about 28573.4124843359. The cubic root of 816439901 is about 934.6336372434.

The spelling of 816439901 in words is "eight hundred sixteen million, four hundred thirty-nine thousand, nine hundred one".