213497784 has 24 divisors (see below), whose sum is σ = 578223360. Its totient is φ = 71165904.

The previous prime is 213497773. The next prime is 213497819. The reversal of 213497784 is 487794312.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

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, 1482552 + ... + 1482695.

It is an arithmetic number, because the mean of its divisors is an integer number (24092640).

Almost surely, 2^213497784 is an apocalyptic number.

213497784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213497784 is an abundant number, since it is smaller than the sum of its proper divisors (364725576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213497784 is a wasteful number, since it uses less digits than its factorization.

213497784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965259 (or 2965252 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 213497784 is about 14611.5633660468. The cubic root of 213497784 is about 597.6741288559.

The spelling of 213497784 in words is "two hundred thirteen million, four hundred ninety-seven thousand, seven hundred eighty-four".