1009899540 has 72 divisors (see below), whose sum is σ = 3299012808. Its totient is φ = 248590080.

The previous prime is 1009899523. The next prime is 1009899557. The reversal of 1009899540 is 459989001.

1009899540 is a `hidden beast` number, since 10 + 0 + 9 + 8 + 99 + 540 = 666.

1009899540 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1009899523) and next prime (1009899557).

It can be written as a sum of positive squares in 4 ways, for example, as 63968004 + 945931536 = 7998^2 + 30756^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213451 + ... + 218130.

Almost surely, 2^1009899540 is an apocalyptic number.

1009899540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1009899540 is an abundant number, since it is smaller than the sum of its proper divisors (2289113268).

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

1009899540 is a wasteful number, since it uses less digits than its factorization.

1009899540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431609 (or 431604 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 1009899540 is about 31778.9165957557. The cubic root of 1009899540 is about 1003.2890171729.

The spelling of 1009899540 in words is "one billion, nine million, eight hundred ninety-nine thousand, five hundred forty".