1242171900 has 108 divisors (see below), whose sum is σ = 3908077992. Its totient is φ = 330007680.

The previous prime is 1242171871. The next prime is 1242171913. The reversal of 1242171900 is 91712421.

It is a super-2 number, since 2×1242171900² = 3085982058299220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 252262 + ... + 257138.

Almost surely, 2^1242171900 is an apocalyptic number.

1242171900 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 1242171900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1954038996).

1242171900 is an abundant number, since it is smaller than the sum of its proper divisors (2665906092).

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

1242171900 is a wasteful number, since it uses less digits than its factorization.

1242171900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180 (or 5170 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1242171900 is about 35244.4591389909. The cubic root of 1242171900 is about 1074.9639504767.

The spelling of 1242171900 in words is "one billion, two hundred forty-two million, one hundred seventy-one thousand, nine hundred".