1240534421 has 48 divisors (see below), whose sum is σ = 1601175600. Its totient is φ = 953745408.

The previous prime is 1240534411. The next prime is 1240534423. The reversal of 1240534421 is 1244350421.

It can be written as a sum of positive squares in 8 ways, for example, as 141943396 + 1098591025 = 11914^2 + 33145^2 .

It is not a de Polignac number, because 1240534421 - 2¹⁰ = 1240533397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240534423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2149685 + ... + 2150261.

It is an arithmetic number, because the mean of its divisors is an integer number (33357825).

Almost surely, 2^1240534421 is an apocalyptic number.

It is an amenable number.

1240534421 is a deficient number, since it is larger than the sum of its proper divisors (360641179).

1240534421 is a wasteful number, since it uses less digits than its factorization.

1240534421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1240534421 is about 35221.2211741728. The cubic root of 1240534421 is about 1074.4913897601.

Adding to 1240534421 its reverse (1244350421), we get a palindrome (2484884842).

The spelling of 1240534421 in words is "one billion, two hundred forty million, five hundred thirty-four thousand, four hundred twenty-one".