1243140045 has 128 divisors (see below), whose sum is σ = 2506982400. Its totient is φ = 523837440.

The previous prime is 1243140001. The next prime is 1243140061. The reversal of 1243140045 is 5400413421.

It is not a de Polignac number, because 1243140045 - 2⁶ = 1243139981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243139997 and 1243140024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5335249 + ... + 5335481.

It is an arithmetic number, because the mean of its divisors is an integer number (19585800).

Almost surely, 2^1243140045 is an apocalyptic number.

1243140045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1243140045 is an abundant number, since it is smaller than the sum of its proper divisors (1263842355).

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

1243140045 is a wasteful number, since it uses less digits than its factorization.

1243140045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1243140045 is about 35258.1911759523. The cubic root of 1243140045 is about 1075.2431524971.

Adding to 1243140045 its reverse (5400413421), we get a palindrome (6643553466).

The spelling of 1243140045 in words is "one billion, two hundred forty-three million, one hundred forty thousand, forty-five".