818257997 has 16 divisors (see below), whose sum is σ = 877599360. Its totient is φ = 761398848.

The previous prime is 818257987. The next prime is 818258003. The reversal of 818257997 is 799752818.

It is a cyclic number.

It is not a de Polignac number, because 818257997 - 2⁴ = 818257981 is a prime.

It is a super-2 number, since 2×818257997² = 1339092299308904018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818257967) 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, 111248 + ... + 118374.

It is an arithmetic number, because the mean of its divisors is an integer number (54849960).

Almost surely, 2^818257997 is an apocalyptic number.

It is an amenable number.

818257997 is a deficient number, since it is larger than the sum of its proper divisors (59341363).

818257997 is a wasteful number, since it uses less digits than its factorization.

818257997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300.

The product of its digits is 2540160, while the sum is 56.

The square root of 818257997 is about 28605.2092633492. The cubic root of 818257997 is about 935.3268884760.

The spelling of 818257997 in words is "eight hundred eighteen million, two hundred fifty-seven thousand, nine hundred ninety-seven".