214390781 has 8 divisors (see below), whose sum is σ = 236197728. Its totient is φ = 192970000.

The previous prime is 214390747. The next prime is 214390789. The reversal of 214390781 is 187093412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 214390781 - 2²² = 210196477 is a prime.

It is a super-2 number, since 2×214390781² = 91926813955579922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214390789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95375 + ... + 97596.

It is an arithmetic number, because the mean of its divisors is an integer number (29524716).

Almost surely, 2^214390781 is an apocalyptic number.

It is an amenable number.

214390781 is a deficient number, since it is larger than the sum of its proper divisors (21806947).

214390781 is a wasteful number, since it uses less digits than its factorization.

214390781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193083.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 214390781 is about 14642.0893659341. The cubic root of 214390781 is about 598.5062667618.

The spelling of 214390781 in words is "two hundred fourteen million, three hundred ninety thousand, seven hundred eighty-one".