19402949 has 2 divisors, whose sum is σ = 19402950. Its totient is φ = 19402948.

The previous prime is 19402921. The next prime is 19402987. The reversal of 19402949 is 94920491.

It is a happy number.

It is an a-pointer prime, because the next prime (19402987) can be obtained adding 19402949 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 174724 = 4385^2 + 418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19402949 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 (19402909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9701474 + 9701475.

It is an arithmetic number, because the mean of its divisors is an integer number (9701475).

Almost surely, 2^19402949 is an apocalyptic number.

It is an amenable number.

19402949 is a deficient number, since it is larger than the sum of its proper divisors (1).

19402949 is an equidigital number, since it uses as much as digits as its factorization.

19402949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 19402949 is about 4404.8778643681. The cubic root of 19402949 is about 268.7133525655.

The spelling of 19402949 in words is "nineteen million, four hundred two thousand, nine hundred forty-nine".