1231240540 has 12 divisors (see below), whose sum is σ = 2585605176. Its totient is φ = 492496208.

The previous prime is 1231240523. The next prime is 1231240541. The reversal of 1231240540 is 450421321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231240541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30780994 + ... + 30781033.

It is an arithmetic number, because the mean of its divisors is an integer number (215467098).

Almost surely, 2^1231240540 is an apocalyptic number.

1231240540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231240540 is an abundant number, since it is smaller than the sum of its proper divisors (1354364636).

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

1231240540 is a wasteful number, since it uses less digits than its factorization.

1231240540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61562036 (or 61562034 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1231240540 is about 35089.0373193680. The cubic root of 1231240540 is about 1071.8013561816.

Adding to 1231240540 its reverse (450421321), we get a palindrome (1681661861).

The spelling of 1231240540 in words is "one billion, two hundred thirty-one million, two hundred forty thousand, five hundred forty".