75427139 has 2 divisors, whose sum is σ = 75427140. Its totient is φ = 75427138.

The previous prime is 75427129. The next prime is 75427153. The reversal of 75427139 is 93172457.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 75427139 - 2¹⁶ = 75361603 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (75427129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37713569 + 37713570.

It is an arithmetic number, because the mean of its divisors is an integer number (37713570).

Almost surely, 2^75427139 is an apocalyptic number.

75427139 is a deficient number, since it is larger than the sum of its proper divisors (1).

75427139 is an equidigital number, since it uses as much as digits as its factorization.

75427139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 75427139 is about 8684.8799070569. The cubic root of 75427139 is about 422.5154020271.

The spelling of 75427139 in words is "seventy-five million, four hundred twenty-seven thousand, one hundred thirty-nine".