1242345533440 has 208 divisors, whose sum is σ = 3282748352640. Its totient is φ = 447531253760.

The previous prime is 1242345533423. The next prime is 1242345533447. The reversal of 1242345533440 is 443355432421.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1242345533393 and 1242345533402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242345533447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24079191 + ... + 24130729.

Almost surely, 2^{1242345533440} is an apocalyptic number.

1242345533440 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 1242345533440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1641374176320).

1242345533440 is an abundant number, since it is smaller than the sum of its proper divisors (2040402819200).

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

1242345533440 is a wasteful number, since it uses less digits than its factorization.

1242345533440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51686 (or 51664 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 40.

The spelling of 1242345533440 in words is "one trillion, two hundred forty-two billion, three hundred forty-five million, five hundred thirty-three thousand, four hundred forty".