1243398400 has 108 divisors (see below), whose sum is σ = 3211794432. Its totient is φ = 475678720.

The previous prime is 1243398397. The next prime is 1243398413. The reversal of 1243398400 is 48933421.

It is a super-2 number, since 2×1243398400² = 3092079162245120000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142977 + ... + 151423.

Almost surely, 2^1243398400 is an apocalyptic number.

1243398400 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 1243398400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1605897216).

1243398400 is an abundant number, since it is smaller than the sum of its proper divisors (1968396032).

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

1243398400 is an equidigital number, since it uses as much as digits as its factorization.

1243398400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496 (or 8477 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1243398400 is about 35261.8547441850. The cubic root of 1243398400 is about 1075.3176346398.

The spelling of 1243398400 in words is "one billion, two hundred forty-three million, three hundred ninety-eight thousand, four hundred".