19624949 has 2 divisors, whose sum is σ = 19624950. Its totient is φ = 19624948.

The previous prime is 19624933. The next prime is 19624961. The reversal of 19624949 is 94942691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 49 = 4430^2 + 7^2 .

It is a cyclic number.

It is not a de Polignac number, because 19624949 - 2⁴ = 19624933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19624349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9812474 + 9812475.

It is an arithmetic number, because the mean of its divisors is an integer number (9812475).

Almost surely, 2^19624949 is an apocalyptic number.

It is an amenable number.

19624949 is a deficient number, since it is larger than the sum of its proper divisors (1).

19624949 is an equidigital number, since it uses as much as digits as its factorization.

19624949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 19624949 is about 4430.0055304706. The cubic root of 19624949 is about 269.7343019499.

It can be divided in two parts, 196249 and 49, that multiplied together give a square (9616201 = 3101²).

The spelling of 19624949 in words is "nineteen million, six hundred twenty-four thousand, nine hundred forty-nine".