19672491427 has 4 divisors (see below), whose sum is σ = 19909509480. Its totient is φ = 19435473376.

The previous prime is 19672491413. The next prime is 19672491451. The reversal of 19672491427 is 72419427691.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19672491427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19672491227) 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, 118508902 + ... + 118509067.

It is an arithmetic number, because the mean of its divisors is an integer number (4977377370).

Almost surely, 2^19672491427 is an apocalyptic number.

19672491427 is a deficient number, since it is larger than the sum of its proper divisors (237018053).

19672491427 is an equidigital number, since it uses as much as digits as its factorization.

19672491427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237018052.

The product of its digits is 1524096, while the sum is 52.

The spelling of 19672491427 in words is "nineteen billion, six hundred seventy-two million, four hundred ninety-one thousand, four hundred twenty-seven".