1245245820 has 288 divisors, whose sum is σ = 4513130496. Its totient is φ = 254016000.

The previous prime is 1245245797. The next prime is 1245245821. The reversal of 1245245820 is 285425421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245245821) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1184295 + ... + 1185345.

It is an arithmetic number, because the mean of its divisors is an integer number (15670592).

Almost surely, 2^1245245820 is an apocalyptic number.

1245245820 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 1245245820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2256565248).

1245245820 is an abundant number, since it is smaller than the sum of its proper divisors (3267884676).

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

1245245820 is a wasteful number, since it uses less digits than its factorization.

1245245820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 33.

The square root of 1245245820 is about 35288.0407503732. The cubic root of 1245245820 is about 1075.8499339277.

The spelling of 1245245820 in words is "one billion, two hundred forty-five million, two hundred forty-five thousand, eight hundred twenty".