212758381 has 8 divisors (see below), whose sum is σ = 232425504. Its totient is φ = 193145520.

The previous prime is 212758379. The next prime is 212758411. The reversal of 212758381 is 183857212.

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 212758381 - 2¹ = 212758379 is a prime.

It is a super-2 number, since 2×212758381² = 90532257371482322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212758381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212758361) 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, 5131 + ... + 21256.

It is an arithmetic number, because the mean of its divisors is an integer number (29053188).

Almost surely, 2^212758381 is an apocalyptic number.

It is an amenable number.

212758381 is a deficient number, since it is larger than the sum of its proper divisors (19667123).

212758381 is a wasteful number, since it uses less digits than its factorization.

212758381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27131.

The product of its digits is 26880, while the sum is 37.

The square root of 212758381 is about 14586.2394399653. The cubic root of 212758381 is about 596.9833594775.

The spelling of 212758381 in words is "two hundred twelve million, seven hundred fifty-eight thousand, three hundred eighty-one".