1243431400 has 24 divisors (see below), whose sum is σ = 2890978470. Its totient is φ = 497372480.

The previous prime is 1243431377. The next prime is 1243431407. The reversal of 1243431400 is 41343421.

1243431400 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 535552164 + 707879236 = 23142^2 + 26606^2 .

It is a super-2 number, since 2×1243431400² = 3092243293011920000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243431407) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 3108379 + ... + 3108778.

Almost surely, 2^1243431400 is an apocalyptic number.

1243431400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243431400 is an abundant number, since it is smaller than the sum of its proper divisors (1647547070).

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

1243431400 is a wasteful number, since it uses less digits than its factorization.

1243431400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6217173 (or 6217164 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1243431400 is about 35262.3226688203. The cubic root of 1243431400 is about 1075.3271475919.

Adding to 1243431400 its reverse (41343421), we get a palindrome (1284774821).

It can be divided in two parts, 12434 and 31400, that added together give a palindrome (43834).

The spelling of 1243431400 in words is "one billion, two hundred forty-three million, four hundred thirty-one thousand, four hundred".