214323781 has 16 divisors (see below), whose sum is σ = 258280960. Its totient is φ = 173735280.

The previous prime is 214323737. The next prime is 214323817. The reversal of 214323781 is 187323412.

It is a cyclic number.

It is not a de Polignac number, because 214323781 - 2¹¹ = 214321733 is a prime.

It is a super-2 number, since 2×214323781² = 91869366204271922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214323701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106870 + ... + 108856.

It is an arithmetic number, because the mean of its divisors is an integer number (16142560).

Almost surely, 2^214323781 is an apocalyptic number.

It is an amenable number.

214323781 is a deficient number, since it is larger than the sum of its proper divisors (43957179).

214323781 is a wasteful number, since it uses less digits than its factorization.

214323781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824.

The product of its digits is 8064, while the sum is 31.

The square root of 214323781 is about 14639.8012623123. The cubic root of 214323781 is about 598.4439131822.

The spelling of 214323781 in words is "two hundred fourteen million, three hundred twenty-three thousand, seven hundred eighty-one".