999405487 has 2 divisors, whose sum is σ = 999405488. Its totient is φ = 999405486.

The previous prime is 999405479. The next prime is 999405493. The reversal of 999405487 is 784504999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999405487 - 2³ = 999405479 is a prime.

It is a super-2 number, since 2×999405487² = 1997622654891414338, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999405427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499702743 + 499702744.

It is an arithmetic number, because the mean of its divisors is an integer number (499702744).

Almost surely, 2^999405487 is an apocalyptic number.

999405487 is a deficient number, since it is larger than the sum of its proper divisors (1).

999405487 is an equidigital number, since it uses as much as digits as its factorization.

999405487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 999405487 is about 31613.3751282586. The cubic root of 999405487 is about 999.8017897153.

The spelling of 999405487 in words is "nine hundred ninety-nine million, four hundred five thousand, four hundred eighty-seven".