19412639 has 4 divisors (see below), whose sum is σ = 19886160. Its totient is φ = 18939120.

The previous prime is 19412567. The next prime is 19412641. The reversal of 19412639 is 93621491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93621491 = 41 ⋅2283451.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19412639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19412599 and 19412608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19412669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236699 + ... + 236780.

It is an arithmetic number, because the mean of its divisors is an integer number (4971540).

Almost surely, 2^19412639 is an apocalyptic number.

19412639 is a deficient number, since it is larger than the sum of its proper divisors (473521).

19412639 is an equidigital number, since it uses as much as digits as its factorization.

19412639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473520.

The product of its digits is 11664, while the sum is 35.

The square root of 19412639 is about 4405.9776440649. The cubic root of 19412639 is about 268.7580777093.

The spelling of 19412639 in words is "nineteen million, four hundred twelve thousand, six hundred thirty-nine".