219947742 has 48 divisors (see below), whose sum is σ = 547458912. Its totient is φ = 62516160.

The previous prime is 219947729. The next prime is 219947789. The reversal of 219947742 is 247749912.

It is a happy number.

219947742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20392 + ... + 29252.

It is an arithmetic number, because the mean of its divisors is an integer number (11405394).

Almost surely, 2^219947742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 219947742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273729456).

219947742 is an abundant number, since it is smaller than the sum of its proper divisors (327511170).

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

219947742 is a wasteful number, since it uses less digits than its factorization.

219947742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9073 (or 9070 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 219947742 is about 14830.6352527463. The cubic root of 219947742 is about 603.6332711589.

The spelling of 219947742 in words is "two hundred nineteen million, nine hundred forty-seven thousand, seven hundred forty-two".