215461312 has 42 divisors (see below), whose sum is σ = 469975184. Its totient is φ = 97933440.

The previous prime is 215461307. The next prime is 215461319. The reversal of 215461312 is 213164512.

It is a happy number.

It is a super-2 number, since 2×215461312² = 92847153937522688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215461319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6168 + ... + 21655.

Almost surely, 2^215461312 is an apocalyptic number.

215461312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

215461312 is an abundant number, since it is smaller than the sum of its proper divisors (254513872).

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

215461312 is a wasteful number, since it uses less digits than its factorization.

215461312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27857 (or 27836 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 215461312 is about 14678.6004782472. The cubic root of 215461312 is about 599.5007995949.

The spelling of 215461312 in words is "two hundred fifteen million, four hundred sixty-one thousand, three hundred twelve".