1243601540 has 48 divisors (see below), whose sum is σ = 2665943280. Its totient is φ = 487119360.

The previous prime is 1243601521. The next prime is 1243601551. The reversal of 1243601540 is 451063421.

It can be written as a sum of positive squares in 8 ways, for example, as 134977924 + 1108623616 = 11618^2 + 33296^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 869546 + ... + 870974.

It is an arithmetic number, because the mean of its divisors is an integer number (55540485).

Almost surely, 2^1243601540 is an apocalyptic number.

1243601540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243601540 is an abundant number, since it is smaller than the sum of its proper divisors (1422341740).

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

1243601540 is a wasteful number, since it uses less digits than its factorization.

1243601540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312 (or 2310 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1243601540 is about 35264.7350762770. The cubic root of 1243601540 is about 1075.3761913957.

Adding to 1243601540 its reverse (451063421), we get a palindrome (1694664961).

The spelling of 1243601540 in words is "one billion, two hundred forty-three million, six hundred one thousand, five hundred forty".