1243378100 has 18 divisors (see below), whose sum is σ = 2698130694. Its totient is φ = 497351200.

The previous prime is 1243378061. The next prime is 1243378127. The reversal of 1243378100 is 18733421.

It can be written as a sum of positive squares in 3 ways, for example, as 45941284 + 1197436816 = 6778^2 + 34604^2 .

It is a super-2 number, since 2×1243378100² = 3091978199119220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6216791 + ... + 6216990.

Almost surely, 2^1243378100 is an apocalyptic number.

1243378100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243378100 is an abundant number, since it is smaller than the sum of its proper divisors (1454752594).

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

1243378100 is a wasteful number, since it uses less digits than its factorization.

1243378100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12433795 (or 12433788 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1243378100 is about 35261.5668965518. The cubic root of 1243378100 is about 1075.3117826494.

The spelling of 1243378100 in words is "one billion, two hundred forty-three million, three hundred seventy-eight thousand, one hundred".