1971397019894 has 32 divisors (see below), whose sum is σ = 3149978098176. Its totient is φ = 922120848000.

The previous prime is 1971397019881. The next prime is 1971397019923. The reversal of 1971397019894 is 4989107931791.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3918887 + ... + 4393229.

It is an arithmetic number, because the mean of its divisors is an integer number (98436815568).

Almost surely, 2^{1971397019894} is an apocalyptic number.

1971397019894 is a deficient number, since it is larger than the sum of its proper divisors (1178581078282).

1971397019894 is a wasteful number, since it uses less digits than its factorization.

1971397019894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475100.

The product of its (nonzero) digits is 30862944, while the sum is 68.

The spelling of 1971397019894 in words is "one trillion, nine hundred seventy-one billion, three hundred ninety-seven million, nineteen thousand, eight hundred ninety-four".