19425381 has 4 divisors (see below), whose sum is σ = 25900512. Its totient is φ = 12950252.

The previous prime is 19425347. The next prime is 19425421. The reversal of 19425381 is 18352491.

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.

It is a cyclic number.

It is not a de Polignac number, because 19425381 - 2⁹ = 19424869 is a prime.

It is a super-2 number, since 2×19425381² = 754690853990322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19425181) 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, 3237561 + ... + 3237566.

It is an arithmetic number, because the mean of its divisors is an integer number (6475128).

Almost surely, 2^19425381 is an apocalyptic number.

It is an amenable number.

19425381 is a deficient number, since it is larger than the sum of its proper divisors (6475131).

19425381 is an equidigital number, since it uses as much as digits as its factorization.

19425381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475130.

The product of its digits is 8640, while the sum is 33.

The square root of 19425381 is about 4407.4233969520. The cubic root of 19425381 is about 268.8168670104.

The spelling of 19425381 in words is "nineteen million, four hundred twenty-five thousand, three hundred eighty-one".