1901968807 has 4 divisors (see below), whose sum is σ = 1914083416. Its totient is φ = 1889854200.

The previous prime is 1901968771. The next prime is 1901968811. The reversal of 1901968807 is 7088691091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7088691091 = 22691 ⋅312401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1901968807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901968847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6057069 + ... + 6057382.

It is an arithmetic number, because the mean of its divisors is an integer number (478520854).

Almost surely, 2^1901968807 is an apocalyptic number.

1901968807 is a deficient number, since it is larger than the sum of its proper divisors (12114609).

1901968807 is a wasteful number, since it uses less digits than its factorization.

1901968807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12114608.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 1901968807 is about 43611.5673531690. The cubic root of 1901968807 is about 1238.9899872447.

The spelling of 1901968807 in words is "one billion, nine hundred one million, nine hundred sixty-eight thousand, eight hundred seven".