19972743 has 24 divisors (see below), whose sum is σ = 32613120. Its totient is φ = 10810800.

The previous prime is 19972741. The next prime is 19972747. The reversal of 19972743 is 34727991.

It is not a de Polignac number, because 19972743 - 2¹ = 19972741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19972695 and 19972704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 783 + ... + 6368.

It is an arithmetic number, because the mean of its divisors is an integer number (1358880).

Almost surely, 2^19972743 is an apocalyptic number.

19972743 is a deficient number, since it is larger than the sum of its proper divisors (12640377).

19972743 is a wasteful number, since it uses less digits than its factorization.

19972743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187 (or 7180 counting only the distinct ones).

The product of its digits is 95256, while the sum is 42.

The square root of 19972743 is about 4469.0874907524. The cubic root of 19972743 is about 271.3183941304.

The spelling of 19972743 in words is "nineteen million, nine hundred seventy-two thousand, seven hundred forty-three".