1242900 has 54 divisors (see below), whose sum is σ = 3898622. Its totient is φ = 331200.

The previous prime is 1242893. The next prime is 1242929. The reversal of 1242900 is 92421.

1242900 = T₁₀₅ + T₁₀₆ + ... + T₂₀₄.

It can be written as a sum of positive squares in 3 ways, for example, as 63504 + 1179396 = 252^2 + 1086^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 210 + ... + 1590.

2^1242900 is an apocalyptic number.

1242900 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 1242900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1949311).

1242900 is an abundant number, since it is smaller than the sum of its proper divisors (2655722).

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

1242900 is a wasteful number, since it uses less digits than its factorization.

1242900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1242900 is about 1114.8542505637. The cubic root of 1242900 is about 107.5173939765.

The spelling of 1242900 in words is "one million, two hundred forty-two thousand, nine hundred".