213771894 has 16 divisors (see below), whose sum is σ = 488621568. Its totient is φ = 61077672.

The previous prime is 213771893. The next prime is 213771917. The reversal of 213771894 is 498177312.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 5089807 = 213771894 / (2 + 1 + 3 + 7 + 7 + 1 + 8 + 9 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213771893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2544862 + ... + 2544945.

It is an arithmetic number, because the mean of its divisors is an integer number (30538848).

Almost surely, 2^213771894 is an apocalyptic number.

213771894 is an abundant number, since it is smaller than the sum of its proper divisors (274849674).

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

213771894 is a wasteful number, since it uses less digits than its factorization.

213771894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089819.

The product of its digits is 84672, while the sum is 42.

The square root of 213771894 is about 14620.9402570423. The cubic root of 213771894 is about 597.9298042532.

The spelling of 213771894 in words is "two hundred thirteen million, seven hundred seventy-one thousand, eight hundred ninety-four".