1242279400 has 24 divisors (see below), whose sum is σ = 2888300070. Its totient is φ = 496911680.

The previous prime is 1242279383. The next prime is 1242279407. The reversal of 1242279400 is 49722421.

It can be written as a sum of positive squares in 3 ways, for example, as 818989924 + 423289476 = 28618^2 + 20574^2 .

It is not an unprimeable number, because it can be changed into a prime (1242279407) 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, 3105499 + ... + 3105898.

Almost surely, 2^1242279400 is an apocalyptic number.

1242279400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242279400 is an abundant number, since it is smaller than the sum of its proper divisors (1646020670).

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

1242279400 is a wasteful number, since it uses less digits than its factorization.

1242279400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6211413 (or 6211404 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 1242279400 is about 35245.9841684127. The cubic root of 1242279400 is about 1074.9949594139.

The spelling of 1242279400 in words is "one billion, two hundred forty-two million, two hundred seventy-nine thousand, four hundred".