19929427 has 12 divisors (see below), whose sum is σ = 23327136. Its totient is φ = 16976400.

The previous prime is 19929419. The next prime is 19929443. The reversal of 19929427 is 72492991.

It is not a de Polignac number, because 19929427 - 2³ = 19929419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19929407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7302 + ... + 9652.

It is an arithmetic number, because the mean of its divisors is an integer number (1943928).

Almost surely, 2^19929427 is an apocalyptic number.

19929427 is a deficient number, since it is larger than the sum of its proper divisors (3397709).

19929427 is a wasteful number, since it uses less digits than its factorization.

19929427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538 (or 2531 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 19929427 is about 4464.2386808951. The cubic root of 19929427 is about 271.1221110617.

The spelling of 19929427 in words is "nineteen million, nine hundred twenty-nine thousand, four hundred twenty-seven".