19944261 has 12 divisors (see below), whose sum is σ = 29174080. Its totient is φ = 13127400.

The previous prime is 19944259. The next prime is 19944263. The reversal of 19944261 is 16244991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19944259) and next prime (19944263).

It is not a de Polignac number, because 19944261 - 2¹ = 19944259 is a prime.

It is a super-2 number, since 2×19944261² = 795547093672242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13315 + ... + 14736.

Almost surely, 2^19944261 is an apocalyptic number.

It is an amenable number.

19944261 is a deficient number, since it is larger than the sum of its proper divisors (9229819).

19944261 is a wasteful number, since it uses less digits than its factorization.

19944261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28136 (or 28133 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 19944261 is about 4465.8997973533. The cubic root of 19944261 is about 271.1893621666.

The spelling of 19944261 in words is "nineteen million, nine hundred forty-four thousand, two hundred sixty-one".