87406489 has 2 divisors, whose sum is σ = 87406490. Its totient is φ = 87406488.

The previous prime is 87406399. The next prime is 87406513. The reversal of 87406489 is 98460478.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47817225 + 39589264 = 6915^2 + 6292^2 .

It is a cyclic number.

It is not a de Polignac number, because 87406489 - 2¹¹ = 87404441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87406889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43703244 + 43703245.

It is an arithmetic number, because the mean of its divisors is an integer number (43703245).

Almost surely, 2^87406489 is an apocalyptic number.

It is an amenable number.

87406489 is a deficient number, since it is larger than the sum of its proper divisors (1).

87406489 is an equidigital number, since it uses as much as digits as its factorization.

87406489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 87406489 is about 9349.1437575855. The cubic root of 87406489 is about 443.7937944213.

The spelling of 87406489 in words is "eighty-seven million, four hundred six thousand, four hundred eighty-nine".