1351232240 has 80 divisors (see below), whose sum is σ = 3202670016. Its totient is φ = 530073600.

The previous prime is 1351232171. The next prime is 1351232249. The reversal of 1351232240 is 422321531.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351232249) 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, 1322930 + ... + 1323950.

Almost surely, 2^1351232240 is an apocalyptic number.

1351232240 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 1351232240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1601335008).

1351232240 is an abundant number, since it is smaller than the sum of its proper divisors (1851437776).

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

1351232240 is a wasteful number, since it uses less digits than its factorization.

1351232240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1332 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1351232240 is about 36759.1109794565. The cubic root of 1351232240 is about 1105.5456148118.

Adding to 1351232240 its reverse (422321531), we get a palindrome (1773553771).

The spelling of 1351232240 in words is "one billion, three hundred fifty-one million, two hundred thirty-two thousand, two hundred forty".