215029140 has 24 divisors (see below), whose sum is σ = 602081760. Its totient is φ = 57341088.

The previous prime is 215029123. The next prime is 215029147. The reversal of 215029140 is 41920512.

It is a self number, because there is not a number n which added to its sum of digits gives 215029140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215029147) 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, 1791850 + ... + 1791969.

It is an arithmetic number, because the mean of its divisors is an integer number (25086740).

Almost surely, 2^215029140 is an apocalyptic number.

215029140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215029140 is an abundant number, since it is smaller than the sum of its proper divisors (387052620).

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

215029140 is a wasteful number, since it uses less digits than its factorization.

215029140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583831 (or 3583829 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 215029140 is about 14663.8719307010. The cubic root of 215029140 is about 599.0997053471.

Adding to 215029140 its reverse (41920512), we get a palindrome (256949652).

The spelling of 215029140 in words is "two hundred fifteen million, twenty-nine thousand, one hundred forty".