999979237 has 2 divisors, whose sum is σ = 999979238. Its totient is φ = 999979236.

The previous prime is 999979159. The next prime is 999979273. The reversal of 999979237 is 732979999.

Together with next prime (999979273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 771395076 + 228584161 = 27774^2 + 15119^2 .

It is a cyclic number.

It is not a de Polignac number, because 999979237 - 2¹⁵ = 999946469 is a prime.

It is a super-2 number, since 2×999979237² = 1999916948862204338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999979297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499989618 + 499989619.

It is an arithmetic number, because the mean of its divisors is an integer number (499989619).

Almost surely, 2^999979237 is an apocalyptic number.

It is an amenable number.

999979237 is a deficient number, since it is larger than the sum of its proper divisors (1).

999979237 is an equidigital number, since it uses as much as digits as its factorization.

999979237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17360406, while the sum is 64.

The square root of 999979237 is about 31622.4483081244. The cubic root of 999979237 is about 999.9930789521.

The spelling of 999979237 in words is "nine hundred ninety-nine million, nine hundred seventy-nine thousand, two hundred thirty-seven".