1308861540 has 216 divisors, whose sum is σ = 4768388352. Its totient is φ = 289457280.

The previous prime is 1308861539. The next prime is 1308861581. The reversal of 1308861540 is 451688031.

1308861540 is a `hidden beast` number, since 1 + 30 + 8 + 8 + 615 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1308861495 and 1308861504.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 271027 + ... + 275813.

It is an arithmetic number, because the mean of its divisors is an integer number (22075872).

Almost surely, 2^1308861540 is an apocalyptic number.

1308861540 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 1308861540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384194176).

1308861540 is an abundant number, since it is smaller than the sum of its proper divisors (3459526812).

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

1308861540 is a wasteful number, since it uses less digits than its factorization.

1308861540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847 (or 4835 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1308861540 is about 36178.1914970884. The cubic root of 1308861540 is about 1093.8671213246.

The spelling of 1308861540 in words is "one billion, three hundred eight million, eight hundred sixty-one thousand, five hundred forty".