1245020520 has 32 divisors (see below), whose sum is σ = 3735061920. Its totient is φ = 332005440.

The previous prime is 1245020507. The next prime is 1245020533. The reversal of 1245020520 is 250205421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1245020507) and next prime (1245020533).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5187466 + ... + 5187705.

It is an arithmetic number, because the mean of its divisors is an integer number (116720685).

Almost surely, 2^1245020520 is an apocalyptic number.

1245020520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245020520 is an abundant number, since it is smaller than the sum of its proper divisors (2490041400).

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

1245020520 is a wasteful number, since it uses less digits than its factorization.

1245020520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10375185 (or 10375181 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1245020520 is about 35284.8483063198. The cubic root of 1245020520 is about 1075.7850461747.

Adding to 1245020520 its reverse (250205421), we get a palindrome (1495225941).

The spelling of 1245020520 in words is "one billion, two hundred forty-five million, twenty thousand, five hundred twenty".