19973845 has 16 divisors (see below), whose sum is σ = 25712640. Its totient is φ = 14848704.

The previous prime is 19973843. The next prime is 19973851. The reversal of 19973845 is 54837991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19973845 - 2¹ = 19973843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19973795 and 19973804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19973843) 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, 3052 + ... + 7018.

It is an arithmetic number, because the mean of its divisors is an integer number (1607040).

Almost surely, 2^19973845 is an apocalyptic number.

It is an amenable number.

19973845 is a deficient number, since it is larger than the sum of its proper divisors (5738795).

19973845 is a wasteful number, since it uses less digits than its factorization.

19973845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044.

The product of its digits is 272160, while the sum is 46.

The square root of 19973845 is about 4469.2107804399. The cubic root of 19973845 is about 271.3233840538.

The spelling of 19973845 in words is "nineteen million, nine hundred seventy-three thousand, eight hundred forty-five".