1243670340 has 192 divisors, whose sum is σ = 3909814272. Its totient is φ = 292838400.

The previous prime is 1243670321. The next prime is 1243670347. The reversal of 1243670340 is 430763421.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1243670298 and 1243670307.

It is not an unprimeable number, because it can be changed into a prime (1243670347) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3998785 + ... + 3999095.

It is an arithmetic number, because the mean of its divisors is an integer number (20363616).

Almost surely, 2^1243670340 is an apocalyptic number.

1243670340 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 1243670340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1954907136).

1243670340 is an abundant number, since it is smaller than the sum of its proper divisors (2666143932).

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

1243670340 is a wasteful number, since it uses less digits than its factorization.

1243670340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 1243670340 is about 35265.7105415445. The cubic root of 1243670340 is about 1075.3960221092.

The spelling of 1243670340 in words is "one billion, two hundred forty-three million, six hundred seventy thousand, three hundred forty".