1215245340 has 144 divisors (see below), whose sum is σ = 3916654560. Its totient is φ = 303943680.

The previous prime is 1215245329. The next prime is 1215245351. The reversal of 1215245340 is 435425121.

1215245340 is a `hidden beast` number, since 121 + 5 + 2 + 4 + 534 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1215245329) and next prime (1215245351).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1251055 + ... + 1252025.

It is an arithmetic number, because the mean of its divisors is an integer number (27198990).

Almost surely, 2^1215245340 is an apocalyptic number.

1215245340 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 1215245340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1958327280).

1215245340 is an abundant number, since it is smaller than the sum of its proper divisors (2701409220).

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

1215245340 is a wasteful number, since it uses less digits than its factorization.

1215245340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412 (or 1407 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1215245340 is about 34860.3691890949. The cubic root of 1215245340 is about 1067.1398094107.

The spelling of 1215245340 in words is "one billion, two hundred fifteen million, two hundred forty-five thousand, three hundred forty".