213940919 has 4 divisors (see below), whose sum is σ = 219723144. Its totient is φ = 208158696.

The previous prime is 213940907. The next prime is 213940933. The reversal of 213940919 is 919049312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213940919 is a prime.

It is a super-2 number, since 2×213940919² = 91541433645129122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213940939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2891057 + ... + 2891130.

It is an arithmetic number, because the mean of its divisors is an integer number (54930786).

Almost surely, 2^213940919 is an apocalyptic number.

213940919 is a deficient number, since it is larger than the sum of its proper divisors (5782225).

213940919 is an equidigital number, since it uses as much as digits as its factorization.

213940919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5782224.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 213940919 is about 14626.7193519258. The cubic root of 213940919 is about 598.0873529660.

The spelling of 213940919 in words is "two hundred thirteen million, nine hundred forty thousand, nine hundred nineteen".