87391739 has 2 divisors, whose sum is σ = 87391740. Its totient is φ = 87391738.

The previous prime is 87391727. The next prime is 87391741. The reversal of 87391739 is 93719378.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87391739 is a prime.

Together with 87391741, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 87391693 and 87391702.

It is not a weakly prime, because it can be changed into another prime (87391709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43695869 + 43695870.

It is an arithmetic number, because the mean of its divisors is an integer number (43695870).

Almost surely, 2^87391739 is an apocalyptic number.

87391739 is a deficient number, since it is larger than the sum of its proper divisors (1).

87391739 is an equidigital number, since it uses as much as digits as its factorization.

87391739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 47.

The square root of 87391739 is about 9348.3548820100. The cubic root of 87391739 is about 443.7688293538.

The spelling of 87391739 in words is "eighty-seven million, three hundred ninety-one thousand, seven hundred thirty-nine".