1215254040 has 512 divisors, whose sum is σ = 5000970240. Its totient is φ = 228096000.

The previous prime is 1215253997. The next prime is 1215254081. The reversal of 1215254040 is 404525121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1215254040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8047965 + ... + 8048115.

It is an arithmetic number, because the mean of its divisors is an integer number (9767520).

Almost surely, 2^1215254040 is an apocalyptic number.

1215254040 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 1215254040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2500485120).

1215254040 is an abundant number, since it is smaller than the sum of its proper divisors (3785716200).

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

1215254040 is a wasteful number, since it uses less digits than its factorization.

1215254040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1215254040 is about 34860.4939724038. The cubic root of 1215254040 is about 1067.1423559730.

Adding to 1215254040 its reverse (404525121), we get a palindrome (1619779161).

It can be divided in two parts, 1215 and 254040, that added together give a triangular number (255255 = T₇₁₄).

The spelling of 1215254040 in words is "one billion, two hundred fifteen million, two hundred fifty-four thousand, forty".