1899306540 has 72 divisors (see below), whose sum is σ = 5785267488. Its totient is φ = 504368640.

The previous prime is 1899306527. The next prime is 1899306551. The reversal of 1899306540 is 456039981.

It is a happy number.

1899306540 is a `hidden beast` number, since 18 + 9 + 93 + 0 + 6 + 540 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21489 + ... + 65271.

Almost surely, 2^1899306540 is an apocalyptic number.

1899306540 is a gapful number since it is divisible by the number (10) 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 1899306540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2892633744).

1899306540 is an abundant number, since it is smaller than the sum of its proper divisors (3885960948).

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

1899306540 is a wasteful number, since it uses less digits than its factorization.

1899306540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44039 (or 44034 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1899306540 is about 43581.0341777246. The cubic root of 1899306540 is about 1238.4116282360.

The spelling of 1899306540 in words is "one billion, eight hundred ninety-nine million, three hundred six thousand, five hundred forty".