1891630139 has 16 divisors (see below), whose sum is σ = 2277761280. Its totient is φ = 1534632480.

The previous prime is 1891630133. The next prime is 1891630163. The reversal of 1891630139 is 9310361981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1891630139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1891630096 and 1891630105.

It is not an unprimeable number, because it can be changed into a prime (1891630133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151052 + ... + 163094.

It is an arithmetic number, because the mean of its divisors is an integer number (142360080).

Almost surely, 2^1891630139 is an apocalyptic number.

1891630139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1891630139 is a deficient number, since it is larger than the sum of its proper divisors (386131141).

1891630139 is a wasteful number, since it uses less digits than its factorization.

1891630139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13250.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1891630139 is about 43492.8745773374. The cubic root of 1891630139 is about 1236.7409517047.

The spelling of 1891630139 in words is "one billion, eight hundred ninety-one million, six hundred thirty thousand, one hundred thirty-nine".