1242444400 has 30 divisors (see below), whose sum is σ = 2984973632. Its totient is φ = 496977600.

The previous prime is 1242444377. The next prime is 1242444403. The reversal of 1242444400 is 44442421.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242444403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1552656 + ... + 1553455.

Almost surely, 2^1242444400 is an apocalyptic number.

1242444400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242444400 is an abundant number, since it is smaller than the sum of its proper divisors (1742529232).

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

1242444400 is a wasteful number, since it uses less digits than its factorization.

1242444400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106129 (or 3106118 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

The square root of 1242444400 is about 35248.3247828886. The cubic root of 1242444400 is about 1075.0425510469.

Adding to 1242444400 its reverse (44442421), we get a palindrome (1286886821).

The spelling of 1242444400 in words is "one billion, two hundred forty-two million, four hundred forty-four thousand, four hundred".