43994281 has 2 divisors, whose sum is σ = 43994282. Its totient is φ = 43994280.

The previous prime is 43994273. The next prime is 43994299. The reversal of 43994281 is 18249934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43560000 + 434281 = 6600^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 43994281 - 2³ = 43994273 is a prime.

It is a super-2 number, since 2×43994281² = 3870993521413922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43997281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21997140 + 21997141.

It is an arithmetic number, because the mean of its divisors is an integer number (21997141).

Almost surely, 2^43994281 is an apocalyptic number.

It is an amenable number.

43994281 is a deficient number, since it is larger than the sum of its proper divisors (1).

43994281 is an equidigital number, since it uses as much as digits as its factorization.

43994281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 43994281 is about 6632.8184808571. The cubic root of 43994281 is about 353.0195373683.

The spelling of 43994281 in words is "forty-three million, nine hundred ninety-four thousand, two hundred eighty-one".