215946401 has 12 divisors (see below), whose sum is σ = 239680896. Its totient is φ = 194397720.

The previous prime is 215946397. The next prime is 215946439. The reversal of 215946401 is 104649512.

215946401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215946401 - 2² = 215946397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215946481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3800 + ... + 21126.

It is an arithmetic number, because the mean of its divisors is an integer number (19973408).

Almost surely, 2^215946401 is an apocalyptic number.

It is an amenable number.

215946401 is a deficient number, since it is larger than the sum of its proper divisors (23734495).

215946401 is a wasteful number, since it uses less digits than its factorization.

215946401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17452 (or 17441 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 215946401 is about 14695.1148685541. The cubic root of 215946401 is about 599.9503671907.

The spelling of 215946401 in words is "two hundred fifteen million, nine hundred forty-six thousand, four hundred one".