43978573 has 2 divisors, whose sum is σ = 43978574. Its totient is φ = 43978572.

The previous prime is 43978567. The next prime is 43978591. The reversal of 43978573 is 37587934.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37124649 + 6853924 = 6093^2 + 2618^2 .

It is a cyclic number.

It is not a de Polignac number, because 43978573 - 2⁹ = 43978061 is a prime.

It is a super-2 number, since 2×43978573² = 3868229766232658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43978513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21989286 + 21989287.

It is an arithmetic number, because the mean of its divisors is an integer number (21989287).

Almost surely, 2^43978573 is an apocalyptic number.

It is an amenable number.

43978573 is a deficient number, since it is larger than the sum of its proper divisors (1).

43978573 is an equidigital number, since it uses as much as digits as its factorization.

43978573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 46.

The square root of 43978573 is about 6631.6342631360. The cubic root of 43978573 is about 352.9775175809.

It can be divided in two parts, 43978 and 573, that added together give a triangular number (44551 = T₂₉₈).

The spelling of 43978573 in words is "forty-three million, nine hundred seventy-eight thousand, five hundred seventy-three".