19854749 has 2 divisors, whose sum is σ = 19854750. Its totient is φ = 19854748.

The previous prime is 19854733. The next prime is 19854761. The reversal of 19854749 is 94745891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 7252249 = 3550^2 + 2693^2 .

It is an emirp because it is prime and its reverse (94745891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19854749 - 2⁴ = 19854733 is a prime.

It is a super-2 number, since 2×19854749² = 788422115706002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19854719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9927374 + 9927375.

It is an arithmetic number, because the mean of its divisors is an integer number (9927375).

Almost surely, 2^19854749 is an apocalyptic number.

It is an amenable number.

19854749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19854749 is an equidigital number, since it uses as much as digits as its factorization.

19854749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 19854749 is about 4455.8668068065. The cubic root of 19854749 is about 270.7830446327.

The spelling of 19854749 in words is "nineteen million, eight hundred fifty-four thousand, seven hundred forty-nine".