19451893940 has 48 divisors (see below), whose sum is σ = 41192008704. Its totient is φ = 7715510400.

The previous prime is 19451893939. The next prime is 19451893963. The reversal of 19451893940 is 4939815491.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5529062 + ... + 5532578.

It is an arithmetic number, because the mean of its divisors is an integer number (858166848).

Almost surely, 2^19451893940 is an apocalyptic number.

19451893940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19451893940 is an abundant number, since it is smaller than the sum of its proper divisors (21740114764).

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

19451893940 is a wasteful number, since it uses less digits than its factorization.

19451893940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5768 (or 5766 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 19451893940 in words is "nineteen billion, four hundred fifty-one million, eight hundred ninety-three thousand, nine hundred forty".