19425949 has 2 divisors, whose sum is σ = 19425950. Its totient is φ = 19425948.

The previous prime is 19425947. The next prime is 19425971. The reversal of 19425949 is 94952491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 5846724 = 3685^2 + 2418^2 .

It is a cyclic number.

It is not a de Polignac number, because 19425949 - 2¹ = 19425947 is a prime.

Together with 19425947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19425947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9712974 + 9712975.

It is an arithmetic number, because the mean of its divisors is an integer number (9712975).

Almost surely, 2^19425949 is an apocalyptic number.

It is an amenable number.

19425949 is a deficient number, since it is larger than the sum of its proper divisors (1).

19425949 is an equidigital number, since it uses as much as digits as its factorization.

19425949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 19425949 is about 4407.4878332220. The cubic root of 19425949 is about 268.8194870619.

The spelling of 19425949 in words is "nineteen million, four hundred twenty-five thousand, nine hundred forty-nine".