999899429 has 2 divisors, whose sum is σ = 999899430. Its totient is φ = 999899428.

The previous prime is 999899399. The next prime is 999899443. The reversal of 999899429 is 924998999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 942367204 + 57532225 = 30698^2 + 7585^2 .

It is a cyclic number.

It is not a de Polignac number, because 999899429 - 2¹² = 999895333 is a prime.

It is a super-2 number, since 2×999899429² = 1999597736229052082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999899629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499949714 + 499949715.

It is an arithmetic number, because the mean of its divisors is an integer number (499949715).

Almost surely, 2^999899429 is an apocalyptic number.

It is an amenable number.

999899429 is a deficient number, since it is larger than the sum of its proper divisors (1).

999899429 is an equidigital number, since it uses as much as digits as its factorization.

999899429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 68.

The square root of 999899429 is about 31621.1863945678. The cubic root of 999899429 is about 999.9664752094.

The spelling of 999899429 in words is "nine hundred ninety-nine million, eight hundred ninety-nine thousand, four hundred twenty-nine".