43978087 has 2 divisors, whose sum is σ = 43978088. Its totient is φ = 43978086.

The previous prime is 43978079. The next prime is 43978111. The reversal of 43978087 is 78087934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43978087 - 2³ = 43978079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43978037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21989043 + 21989044.

It is an arithmetic number, because the mean of its divisors is an integer number (21989044).

Almost surely, 2^43978087 is an apocalyptic number.

43978087 is a deficient number, since it is larger than the sum of its proper divisors (1).

43978087 is an equidigital number, since it uses as much as digits as its factorization.

43978087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 43978087 is about 6631.5976204833. The cubic root of 43978087 is about 352.9762173439.

The spelling of 43978087 in words is "forty-three million, nine hundred seventy-eight thousand, eighty-seven".