19597138 has 16 divisors (see below), whose sum is σ = 32355936. Its totient is φ = 8827840.

The previous prime is 19597093. The next prime is 19597153. The reversal of 19597138 is 83179591.

It is a junction number, because it is equal to n+sod(n) for n = 19597094 and 19597103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1456 + ... + 6427.

It is an arithmetic number, because the mean of its divisors is an integer number (2022246).

Almost surely, 2^19597138 is an apocalyptic number.

19597138 is a deficient number, since it is larger than the sum of its proper divisors (12758798).

19597138 is a wasteful number, since it uses less digits than its factorization.

19597138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8009.

The product of its digits is 68040, while the sum is 43.

The square root of 19597138 is about 4426.8654824831. The cubic root of 19597138 is about 269.6068260004.

The spelling of 19597138 in words is "nineteen million, five hundred ninety-seven thousand, one hundred thirty-eight".