19438973 has 4 divisors (see below), whose sum is σ = 20582460. Its totient is φ = 18295488.

The previous prime is 19438963. The next prime is 19438981. The reversal of 19438973 is 37983491.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16999129 + 2439844 = 4123^2 + 1562^2 .

It is a cyclic number.

It is not a de Polignac number, because 19438973 - 2⁸ = 19438717 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 (19438943) 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, 571718 + ... + 571751.

It is an arithmetic number, because the mean of its divisors is an integer number (5145615).

Almost surely, 2^19438973 is an apocalyptic number.

It is an amenable number.

19438973 is a deficient number, since it is larger than the sum of its proper divisors (1143487).

19438973 is a wasteful number, since it uses less digits than its factorization.

19438973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143486.

The product of its digits is 163296, while the sum is 44.

The square root of 19438973 is about 4408.9650713064. The cubic root of 19438973 is about 268.8795497279.

The spelling of 19438973 in words is "nineteen million, four hundred thirty-eight thousand, nine hundred seventy-three".