213432387 has 24 divisors (see below), whose sum is σ = 345436416. Its totient is φ = 116656848.

The previous prime is 213432383. The next prime is 213432403. The reversal of 213432387 is 783234312.

It is not a de Polignac number, because 213432387 - 2² = 213432383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213432383) 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 23 ways as a sum of consecutive naturals, for example, 28183 + ... + 34944.

It is an arithmetic number, because the mean of its divisors is an integer number (14393184).

Almost surely, 2^213432387 is an apocalyptic number.

213432387 is a deficient number, since it is larger than the sum of its proper divisors (132004029).

213432387 is a wasteful number, since it uses less digits than its factorization.

213432387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63167 (or 63160 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 213432387 is about 14609.3253437659. The cubic root of 213432387 is about 597.6130976424.

Adding to 213432387 its reverse (783234312), we get a palindrome (996666699).

The spelling of 213432387 in words is "two hundred thirteen million, four hundred thirty-two thousand, three hundred eighty-seven".