213646403 has 6 divisors (see below), whose sum is σ = 218732364. Its totient is φ = 208676076.

The previous prime is 213646357. The next prime is 213646417. The reversal of 213646403 is 304646312.

It is not a de Polignac number, because 213646403 - 2¹⁴ = 213630019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213646483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55925 + ... + 59622.

It is an arithmetic number, because the mean of its divisors is an integer number (36455394).

Almost surely, 2^213646403 is an apocalyptic number.

213646403 is a deficient number, since it is larger than the sum of its proper divisors (5085961).

213646403 is an equidigital number, since it uses as much as digits as its factorization.

213646403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115633 (or 115590 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 213646403 is about 14616.6481451802. The cubic root of 213646403 is about 597.8127799880.

Subtracting 213646403 from its reverse (304646312), we obtain a palindrome (90999909).

The spelling of 213646403 in words is "two hundred thirteen million, six hundred forty-six thousand, four hundred three".