1245215440 has 120 divisors (see below), whose sum is σ = 3476777472. Its totient is φ = 413118720.

The previous prime is 1245215437. The next prime is 1245215441. The reversal of 1245215440 is 445125421.

It is a super-2 number, since 2×1245215440² = 3101122984028787200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1245215399 and 1245215408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245215441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116397 + ... + 126643.

Almost surely, 2^1245215440 is an apocalyptic number.

1245215440 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 1245215440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1738388736).

1245215440 is an abundant number, since it is smaller than the sum of its proper divisors (2231562032).

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

1245215440 is a wasteful number, since it uses less digits than its factorization.

1245215440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10305 (or 10292 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 1245215440 is about 35287.6102902988. The cubic root of 1245215440 is about 1075.8411847618.

The spelling of 1245215440 in words is "one billion, two hundred forty-five million, two hundred fifteen thousand, four hundred forty".