1217471742 has 128 divisors (see below), whose sum is σ = 2952069120. Its totient is φ = 370798560.

The previous prime is 1217471741. The next prime is 1217471767. The reversal of 1217471742 is 2471747121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1217471697 and 1217471706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217471741) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3965553 + ... + 3965859.

It is an arithmetic number, because the mean of its divisors is an integer number (23063040).

Almost surely, 2^1217471742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1217471742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1476034560).

1217471742 is an abundant number, since it is smaller than the sum of its proper divisors (1734597378).

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

1217471742 is a wasteful number, since it uses less digits than its factorization.

1217471742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 469 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 1217471742 is about 34892.2877151957. The cubic root of 1217471742 is about 1067.7910997807.

The spelling of 1217471742 in words is "one billion, two hundred seventeen million, four hundred seventy-one thousand, seven hundred forty-two".