213987487 has 8 divisors (see below), whose sum is σ = 250522272. Its totient is φ = 178944000.

The previous prime is 213987467. The next prime is 213987493. The reversal of 213987487 is 784789312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213987487 - 2¹⁹ = 213463199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213987487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213987427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372514 + ... + 373087.

It is an arithmetic number, because the mean of its divisors is an integer number (31315284).

Almost surely, 2^213987487 is an apocalyptic number.

213987487 is a deficient number, since it is larger than the sum of its proper divisors (36534785).

213987487 is an equidigital number, since it uses as much as digits as its factorization.

213987487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745649.

The product of its digits is 677376, while the sum is 49.

The square root of 213987487 is about 14628.3111465405. The cubic root of 213987487 is about 598.1307445581.

The spelling of 213987487 in words is "two hundred thirteen million, nine hundred eighty-seven thousand, four hundred eighty-seven".