215261442 has 32 divisors (see below), whose sum is σ = 521847360. Its totient is φ = 65230560.

The previous prime is 215261437. The next prime is 215261443. The reversal of 215261442 is 244162512.

215261442 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 614 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (215261443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180603 + ... + 181790.

It is an arithmetic number, because the mean of its divisors is an integer number (16307730).

Almost surely, 2^215261442 is an apocalyptic number.

215261442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

215261442 is an abundant number, since it is smaller than the sum of its proper divisors (306585918).

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

215261442 is a wasteful number, since it uses less digits than its factorization.

215261442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362415 (or 362409 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 215261442 is about 14671.7906882562. The cubic root of 215261442 is about 599.3153690980.

The spelling of 215261442 in words is "two hundred fifteen million, two hundred sixty-one thousand, four hundred forty-two".