213640790 has 32 divisors (see below), whose sum is σ = 437757696. Its totient is φ = 74308960.

The previous prime is 213640789. The next prime is 213640799. The reversal of 213640790 is 97046312.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213640799) 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 15 ways as a sum of consecutive naturals, for example, 39692 + ... + 44751.

It is an arithmetic number, because the mean of its divisors is an integer number (13679928).

Almost surely, 2^213640790 is an apocalyptic number.

213640790 is an abundant number, since it is smaller than the sum of its proper divisors (224116906).

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

213640790 is a wasteful number, since it uses less digits than its factorization.

213640790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84484.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 213640790 is about 14616.4561368343. The cubic root of 213640790 is about 597.8075446201.

The spelling of 213640790 in words is "two hundred thirteen million, six hundred forty thousand, seven hundred ninety".