19914639 has 8 divisors (see below), whose sum is σ = 26589360. Its totient is φ = 13258176.

The previous prime is 19914607. The next prime is 19914647. The reversal of 19914639 is 93641991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19914639 - 2⁵ = 19914607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19914639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19914649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1774 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (3323670).

Almost surely, 2^19914639 is an apocalyptic number.

19914639 is a deficient number, since it is larger than the sum of its proper divisors (6674721).

19914639 is an equidigital number, since it uses as much as digits as its factorization.

19914639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9129.

The product of its digits is 52488, while the sum is 42.

The square root of 19914639 is about 4462.5821000851. The cubic root of 19914639 is about 271.0550352771.

The spelling of 19914639 in words is "nineteen million, nine hundred fourteen thousand, six hundred thirty-nine".