87430493 has 4 divisors (see below), whose sum is σ = 87451260. Its totient is φ = 87409728.

The previous prime is 87430489. The next prime is 87430513. The reversal of 87430493 is 39403478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39403478 = 2 ⋅19701739.

It can be written as a sum of positive squares in 2 ways, for example, as 45995524 + 41434969 = 6782^2 + 6437^2 .

It is a cyclic number.

It is not a de Polignac number, because 87430493 - 2² = 87430489 is a prime.

It is a super-2 number, since 2×87430493² = 15288182212446098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87430463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1580 + ... + 13317.

It is an arithmetic number, because the mean of its divisors is an integer number (21862815).

Almost surely, 2^87430493 is an apocalyptic number.

It is an amenable number.

87430493 is a deficient number, since it is larger than the sum of its proper divisors (20767).

87430493 is a wasteful number, since it uses less digits than its factorization.

87430493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20766.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 87430493 is about 9350.4274233855. The cubic root of 87430493 is about 443.8344163147.

The spelling of 87430493 in words is "eighty-seven million, four hundred thirty thousand, four hundred ninety-three".