215143242 has 24 divisors (see below), whose sum is σ = 449814624. Its totient is φ = 68595384.

The previous prime is 215143189. The next prime is 215143249. The reversal of 215143242 is 242341512.

215143242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215143242² = 92573229156541128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215143249) 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, 30718 + ... + 37065.

It is an arithmetic number, because the mean of its divisors is an integer number (18742276).

Almost surely, 2^215143242 is an apocalyptic number.

215143242 is an abundant number, since it is smaller than the sum of its proper divisors (234671382).

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

215143242 is a wasteful number, since it uses less digits than its factorization.

215143242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67834 (or 67811 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 215143242 is about 14667.7619969783. The cubic root of 215143242 is about 599.2056543780.

Adding to 215143242 its reverse (242341512), we get a palindrome (457484754).

The spelling of 215143242 in words is "two hundred fifteen million, one hundred forty-three thousand, two hundred forty-two".