1309987854 has 72 divisors (see below), whose sum is σ = 3372059808. Its totient is φ = 366307200.

The previous prime is 1309987823. The next prime is 1309987879. The reversal of 1309987854 is 4587899031.

It is a self number, because there is not a number n which added to its sum of digits gives 1309987854.

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 35 ways as a sum of consecutive naturals, for example, 25654 + ... + 57254.

It is an arithmetic number, because the mean of its divisors is an integer number (46834164).

Almost surely, 2^1309987854 is an apocalyptic number.

1309987854 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309987854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1686029904).

1309987854 is an abundant number, since it is smaller than the sum of its proper divisors (2062071954).

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

1309987854 is a wasteful number, since it uses less digits than its factorization.

1309987854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31670 (or 31660 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 1309987854 is about 36193.7543507164. The cubic root of 1309987854 is about 1094.1807996836.

The spelling of 1309987854 in words is "one billion, three hundred nine million, nine hundred eighty-seven thousand, eight hundred fifty-four".