87420439 has 2 divisors, whose sum is σ = 87420440. Its totient is φ = 87420438.

The previous prime is 87420407. The next prime is 87420451. The reversal of 87420439 is 93402478.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87420439 - 2⁵ = 87420407 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 87420398 and 87420407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87420469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43710219 + 43710220.

It is an arithmetic number, because the mean of its divisors is an integer number (43710220).

Almost surely, 2^87420439 is an apocalyptic number.

87420439 is a deficient number, since it is larger than the sum of its proper divisors (1).

87420439 is an equidigital number, since it uses as much as digits as its factorization.

87420439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 87420439 is about 9349.8897854467. The cubic root of 87420439 is about 443.8174028673.

The spelling of 87420439 in words is "eighty-seven million, four hundred twenty thousand, four hundred thirty-nine".