43999957 has 2 divisors, whose sum is σ = 43999958. Its totient is φ = 43999956.

The previous prime is 43999913. The next prime is 43999981. The reversal of 43999957 is 75999934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32649796 + 11350161 = 5714^2 + 3369^2 .

It is a cyclic number.

It is not a de Polignac number, because 43999957 - 2⁷ = 43999829 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43999898 and 43999907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43999157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21999978 + 21999979.

It is an arithmetic number, because the mean of its divisors is an integer number (21999979).

Almost surely, 2^43999957 is an apocalyptic number.

It is an amenable number.

43999957 is a deficient number, since it is larger than the sum of its proper divisors (1).

43999957 is an equidigital number, since it uses as much as digits as its factorization.

43999957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2755620, while the sum is 55.

The square root of 43999957 is about 6633.2463394631. The cubic root of 43999957 is about 353.0347185288.

It can be divided in two parts, 43 and 999957, that added together give a 6-th power (1000000 = 10⁶).

The spelling of 43999957 in words is "forty-three million, nine hundred ninety-nine thousand, nine hundred fifty-seven".