1213252040 has 256 divisors, whose sum is σ = 3707665920. Its totient is φ = 345047040.

The previous prime is 1213252021. The next prime is 1213252057. The reversal of 1213252040 is 402523121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6286184 + ... + 6286376.

It is an arithmetic number, because the mean of its divisors is an integer number (14483070).

Almost surely, 2^1213252040 is an apocalyptic number.

1213252040 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 1213252040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1853832960).

1213252040 is an abundant number, since it is smaller than the sum of its proper divisors (2494413880).

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

1213252040 is a wasteful number, since it uses less digits than its factorization.

1213252040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1213252040 is about 34831.7676841127. The cubic root of 1213252040 is about 1066.5560332305.

Adding to 1213252040 its reverse (402523121), we get a palindrome (1615775161).

The spelling of 1213252040 in words is "one billion, two hundred thirteen million, two hundred fifty-two thousand, forty".