19425643 has 8 divisors (see below), whose sum is σ = 19652976. Its totient is φ = 19200000.

The previous prime is 19425599. The next prime is 19425647. The reversal of 19425643 is 34652491.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19425643 - 2¹⁷ = 19294571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19425599 and 19425608.

It is not an unprimeable number, because it can be changed into a prime (19425647) 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, 48243 + ... + 48643.

It is an arithmetic number, because the mean of its divisors is an integer number (2456622).

Almost surely, 2^19425643 is an apocalyptic number.

19425643 is a deficient number, since it is larger than the sum of its proper divisors (227333).

19425643 is a wasteful number, since it uses less digits than its factorization.

19425643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845.

The product of its digits is 25920, while the sum is 34.

The square root of 19425643 is about 4407.4531194330. The cubic root of 19425643 is about 268.8180755616.

The spelling of 19425643 in words is "nineteen million, four hundred twenty-five thousand, six hundred forty-three".