1891240072858 has 16 divisors (see below), whose sum is σ = 2882469590784. Its totient is φ = 930448918080.

The previous prime is 1891240072849. The next prime is 1891240072871. The reversal of 1891240072858 is 8582700421981.

It is a junction number, because it is equal to n+sod(n) for n = 1891240072799 and 1891240072808.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7892010 + ... + 8128117.

It is an arithmetic number, because the mean of its divisors is an integer number (180154349424).

Almost surely, 2^{1891240072858} is an apocalyptic number.

1891240072858 is a deficient number, since it is larger than the sum of its proper divisors (991229517926).

1891240072858 is a wasteful number, since it uses less digits than its factorization.

1891240072858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16021077.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 1891240072858 in words is "one trillion, eight hundred ninety-one billion, two hundred forty million, seventy-two thousand, eight hundred fifty-eight".