43920857 has 2 divisors, whose sum is σ = 43920858. Its totient is φ = 43920856.

The previous prime is 43920829. The next prime is 43920871. The reversal of 43920857 is 75802934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38180041 + 5740816 = 6179^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 43920857 - 2⁸ = 43920601 is a prime.

It is a super-2 number, since 2×43920857² = 3858083359228898, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43920857.

It is not a weakly prime, because it can be changed into another prime (43920257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21960428 + 21960429.

It is an arithmetic number, because the mean of its divisors is an integer number (21960429).

Almost surely, 2^43920857 is an apocalyptic number.

It is an amenable number.

43920857 is a deficient number, since it is larger than the sum of its proper divisors (1).

43920857 is an equidigital number, since it uses as much as digits as its factorization.

43920857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 43920857 is about 6627.2812676089. The cubic root of 43920857 is about 352.8230380427.

The spelling of 43920857 in words is "forty-three million, nine hundred twenty thousand, eight hundred fifty-seven".