1243936380 has 96 divisors (see below), whose sum is σ = 3604543488. Its totient is φ = 320198400.

The previous prime is 1243936361. The next prime is 1243936399. The reversal of 1243936380 is 836393421.

1243936380 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1243936361) and next prime (1243936399).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1139635 + ... + 1140725.

It is an arithmetic number, because the mean of its divisors is an integer number (37547328).

Almost surely, 2^1243936380 is an apocalyptic number.

1243936380 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 1243936380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1802271744).

1243936380 is an abundant number, since it is smaller than the sum of its proper divisors (2360607108).

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

1243936380 is a wasteful number, since it uses less digits than its factorization.

1243936380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747 (or 1745 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 1243936380 is about 35269.4822757579. The cubic root of 1243936380 is about 1075.4726978302.

The spelling of 1243936380 in words is "one billion, two hundred forty-three million, nine hundred thirty-six thousand, three hundred eighty".