1242717420 has 144 divisors (see below), whose sum is σ = 4260936960. Its totient is φ = 269087616.

The previous prime is 1242717397. The next prime is 1242717431. The reversal of 1242717420 is 247172421.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44737 + ... + 66983.

It is an arithmetic number, because the mean of its divisors is an integer number (29589840).

Almost surely, 2^1242717420 is an apocalyptic number.

1242717420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242717420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130468480).

1242717420 is an abundant number, since it is smaller than the sum of its proper divisors (3018219540).

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

1242717420 is a wasteful number, since it uses less digits than its factorization.

1242717420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22292 (or 22283 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 1242717420 is about 35252.1973783196. The cubic root of 1242717420 is about 1075.1212900824.

Adding to 1242717420 its reverse (247172421), we get a palindrome (1489889841).

The spelling of 1242717420 in words is "one billion, two hundred forty-two million, seven hundred seventeen thousand, four hundred twenty".