43450139 has 2 divisors, whose sum is σ = 43450140. Its totient is φ = 43450138.

The previous prime is 43450109. The next prime is 43450153. The reversal of 43450139 is 93105434.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43450139 - 2¹² = 43446043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43450109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21725069 + 21725070.

It is an arithmetic number, because the mean of its divisors is an integer number (21725070).

Almost surely, 2^43450139 is an apocalyptic number.

43450139 is a deficient number, since it is larger than the sum of its proper divisors (1).

43450139 is an equidigital number, since it uses as much as digits as its factorization.

43450139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 43450139 is about 6591.6719426865. The cubic root of 43450139 is about 351.5580579482.

It can be divided in two parts, 43450 and 139, that multiplied together give a triangular number (6039550 = T₃₄₇₅).

The spelling of 43450139 in words is "forty-three million, four hundred fifty thousand, one hundred thirty-nine".