861904897 has 8 divisors (see below), whose sum is σ = 985292352. Its totient is φ = 738582000.

The previous prime is 861904891. The next prime is 861904903. The reversal of 861904897 is 798409168.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (861904891) and next prime (861904903).

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 861904897 - 2³ = 861904889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861904891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17022 + ... + 44872.

It is an arithmetic number, because the mean of its divisors is an integer number (123161544).

Almost surely, 2^861904897 is an apocalyptic number.

It is an amenable number.

861904897 is a deficient number, since it is larger than the sum of its proper divisors (123387455).

861904897 is a wasteful number, since it uses less digits than its factorization.

861904897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32279.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 861904897 is about 29358.2168566144. The cubic root of 861904897 is about 951.6701542044.

The spelling of 861904897 in words is "eight hundred sixty-one million, nine hundred four thousand, eight hundred ninety-seven".