19672739 has 4 divisors (see below), whose sum is σ = 19696656. Its totient is φ = 19648824.

The previous prime is 19672729. The next prime is 19672747. The reversal of 19672739 is 93727691.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19672739 - 2⁸ = 19672483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19672739.

It is not an unprimeable number, because it can be changed into a prime (19672729) 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, 10679 + ... + 12384.

It is an arithmetic number, because the mean of its divisors is an integer number (4924164).

Almost surely, 2^19672739 is an apocalyptic number.

19672739 is a deficient number, since it is larger than the sum of its proper divisors (23917).

19672739 is an equidigital number, since it uses as much as digits as its factorization.

19672739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23916.

The product of its digits is 142884, while the sum is 44.

The square root of 19672739 is about 4435.3961491619. The cubic root of 19672739 is about 269.9530736919.

The spelling of 19672739 in words is "nineteen million, six hundred seventy-two thousand, seven hundred thirty-nine".