215401050 has 144 divisors (see below), whose sum is σ = 630140472. Its totient is φ = 52531200.

The previous prime is 215400979. The next prime is 215401079. The reversal of 215401050 is 50104512.

215401050 is a `hidden beast` number, since 21 + 540 + 105 + 0 = 666.

215401050 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 14130081 + 201270969 = 3759^2 + 14187^2 .

It is a super-2 number, since 2×215401050² = 92795224682205000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 282670 + ... + 283430.

Almost surely, 2^215401050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215401050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315070236).

215401050 is an abundant number, since it is smaller than the sum of its proper divisors (414739422).

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

215401050 is a wasteful number, since it uses less digits than its factorization.

215401050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 825 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 215401050 is about 14676.5476185648. The cubic root of 215401050 is about 599.4449032711. Note that the first 3 decimals are identical.

Adding to 215401050 its reverse (50104512), we get a palindrome (265505562).

The spelling of 215401050 in words is "two hundred fifteen million, four hundred one thousand, fifty".