87400039 has 2 divisors, whose sum is σ = 87400040. Its totient is φ = 87400038.

The previous prime is 87399989. The next prime is 87400051. The reversal of 87400039 is 93000478.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87400039 - 2¹¹ = 87397991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87400139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43700019 + 43700020.

It is an arithmetic number, because the mean of its divisors is an integer number (43700020).

Almost surely, 2^87400039 is an apocalyptic number.

87400039 is a deficient number, since it is larger than the sum of its proper divisors (1).

87400039 is an equidigital number, since it uses as much as digits as its factorization.

87400039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 87400039 is about 9348.7987998459. The cubic root of 87400039 is about 443.7828778391.

It can be divided in two parts, 8 and 7400039, that added together give a palindrome (7400047).

The spelling of 87400039 in words is "eighty-seven million, four hundred thousand, thirty-nine".