43999999 has 2 divisors, whose sum is σ = 44000000. Its totient is φ = 43999998.

The previous prime is 43999981. The next prime is 44000003. The reversal of 43999999 is 99999934.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43999999 - 2¹³ = 43991807 is a prime.

43999999 is a modest number, since divided by 9999 gives 4399 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43999799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21999999 + 22000000.

It is an arithmetic number, because the mean of its divisors is an integer number (22000000).

Almost surely, 2^43999999 is an apocalyptic number.

43999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

43999999 is an equidigital number, since it uses as much as digits as its factorization.

43999999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6377292, while the sum is 61.

The square root of 43999999 is about 6633.2495053330. The cubic root of 43999999 is about 353.0348308581.

The spelling of 43999999 in words is "forty-three million, nine hundred ninety-nine thousand, nine hundred ninety-nine".