19427493 has 4 divisors (see below), whose sum is σ = 25903328. Its totient is φ = 12951660.

The previous prime is 19427459. The next prime is 19427501. The reversal of 19427493 is 39472491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39472491 = 3 ⋅13157497.

It is not a de Polignac number, because 19427493 - 2¹⁶ = 19361957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19427423) 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, 3237913 + ... + 3237918.

It is an arithmetic number, because the mean of its divisors is an integer number (6475832).

Almost surely, 2^19427493 is an apocalyptic number.

It is an amenable number.

19427493 is a deficient number, since it is larger than the sum of its proper divisors (6475835).

19427493 is an equidigital number, since it uses as much as digits as its factorization.

19427493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475834.

The product of its digits is 54432, while the sum is 39.

The square root of 19427493 is about 4407.6629862094. The cubic root of 19427493 is about 268.8266089154.

The spelling of 19427493 in words is "nineteen million, four hundred twenty-seven thousand, four hundred ninety-three".