213917990 has 64 divisors (see below), whose sum is σ = 455051520. Its totient is φ = 71379840.

The previous prime is 213917989. The next prime is 213917993. The reversal of 213917990 is 99719312.

213917990 = T₃₈₈ + T₃₈₉ + ... + T₁₁₀₂.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213917993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324281 + ... + 324939.

It is an arithmetic number, because the mean of its divisors is an integer number (7110180).

Almost surely, 2^213917990 is an apocalyptic number.

213917990 is an abundant number, since it is smaller than the sum of its proper divisors (241133530).

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

213917990 is a wasteful number, since it uses less digits than its factorization.

213917990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 213917990 is about 14625.9355256339. The cubic root of 213917990 is about 598.0659856419.

The spelling of 213917990 in words is "two hundred thirteen million, nine hundred seventeen thousand, nine hundred ninety".