1243912140 has 216 divisors, whose sum is σ = 4135556880. Its totient is φ = 313808256.

The previous prime is 1243912133. The next prime is 1243912177. The reversal of 1243912140 is 412193421.

It is a happy number.

1243912140 is a `hidden beast` number, since 12 + 439 + 1 + 214 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1754106 + ... + 1754814.

Almost surely, 2^1243912140 is an apocalyptic number.

1243912140 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 1243912140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2067778440).

1243912140 is an abundant number, since it is smaller than the sum of its proper divisors (2891644740).

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

1243912140 is a wasteful number, since it uses less digits than its factorization.

1243912140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1243912140 is about 35269.1386342224. The cubic root of 1243912140 is about 1075.4657120422.

The spelling of 1243912140 in words is "one billion, two hundred forty-three million, nine hundred twelve thousand, one hundred forty".