499629781 has 8 divisors (see below), whose sum is σ = 581779584. Its totient is φ = 420173520.

The previous prime is 499629773. The next prime is 499629791. The reversal of 499629781 is 187926994.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 499629781 - 2³ = 499629773 is a prime.

It is a super-2 number, since 2×499629781² = 499259836124215922, 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 (499629701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 672985 + ... + 673726.

It is an arithmetic number, because the mean of its divisors is an integer number (72722448).

Almost surely, 2^499629781 is an apocalyptic number.

It is an amenable number.

499629781 is a deficient number, since it is larger than the sum of its proper divisors (82149803).

499629781 is a wasteful number, since it uses less digits than its factorization.

499629781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346771.

The product of its digits is 1959552, while the sum is 55.

The square root of 499629781 is about 22352.3998935237. The cubic root of 499629781 is about 793.5045822714.

The spelling of 499629781 in words is "four hundred ninety-nine million, six hundred twenty-nine thousand, seven hundred eighty-one".