499981000 has 64 divisors (see below), whose sum is σ = 1201664880. Its totient is φ = 194572800.

The previous prime is 499980997. The next prime is 499981021. The reversal of 499981000 is 189994.

It can be written as a sum of positive squares in 8 ways, for example, as 83576164 + 416404836 = 9142^2 + 20406^2 .

It is a super-2 number, since 2×499981000² = 499962000722000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30244 + ... + 43756.

Almost surely, 2^499981000 is an apocalyptic number.

499981000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 499981000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (600832440).

499981000 is an abundant number, since it is smaller than the sum of its proper divisors (701683880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

499981000 is a wasteful number, since it uses less digits than its factorization.

499981000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13571 (or 13557 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 499981000 is about 22360.2549180460. The cubic root of 499981000 is about 793.6904723168.

The spelling of 499981000 in words is "four hundred ninety-nine million, nine hundred eighty-one thousand".