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499999997 = 771428571

499999997 has 4 divisors (see below), whose sum is σ = 571428576. Its totient is φ = 428571420.

The previous prime is 499999993. The next prime is 500000003. The reversal of 499999997 is 799999994.

It can be divided in two parts, 4 and 99999997, that added together give a palindrome (100000001).

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 499999997 - 22 = 499999993 is a prime.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 4 and 99999997 contains 499999997 itself.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499999993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35714279 + ... + 35714292.

It is an arithmetic number, because the mean of its divisors is an integer number (142857144).

Almost surely, 2499999997 is an apocalyptic number.

It is an amenable number.

499999997 is a deficient number, since it is larger than the sum of its proper divisors (71428579).

499999997 is an equidigital number, since it uses as much as digits as its factorization.

499999997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71428578.

The product of its digits is 133923132, while the sum is 74.

The square root of 499999997 is about 22360.6797079159. The cubic root of 499999997 is about 793.7005243967.

The spelling of 499999997 in words is "four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".

Divisors: 1 7 71428571 499999997