1242550100 has 72 divisors (see below), whose sum is σ = 3013307136. Its totient is φ = 440800000.

The previous prime is 1242550039. The next prime is 1242550109. The reversal of 1242550100 is 10552421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242550109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31325 + ... + 58875.

It is an arithmetic number, because the mean of its divisors is an integer number (41851488).

Almost surely, 2^1242550100 is an apocalyptic number.

1242550100 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 1242550100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1506653568).

1242550100 is an abundant number, since it is smaller than the sum of its proper divisors (1770757036).

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

1242550100 is a wasteful number, since it uses less digits than its factorization.

1242550100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27617 (or 27610 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1242550100 is about 35249.8241130364. The cubic root of 1242550100 is about 1075.0730363213.

The spelling of 1242550100 in words is "one billion, two hundred forty-two million, five hundred fifty thousand, one hundred".