499993640 has 32 divisors (see below), whose sum is σ = 1163781000. Its totient is φ = 193100544.

The previous prime is 499993631. The next prime is 499993709. The reversal of 499993640 is 46399994.

It can be written as a sum of positive squares in 4 ways, for example, as 372258436 + 127735204 = 19294^2 + 11302^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214355 + ... + 216674.

Almost surely, 2^499993640 is an apocalyptic number.

499993640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

499993640 is an abundant number, since it is smaller than the sum of its proper divisors (663787360).

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

499993640 is a wasteful number, since it uses less digits than its factorization.

499993640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431069 (or 431065 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 53.

The square root of 499993640 is about 22360.5375606223. The cubic root of 499993640 is about 793.6971606796.

The spelling of 499993640 in words is "four hundred ninety-nine million, nine hundred ninety-three thousand, six hundred forty".