1245722420 has 24 divisors (see below), whose sum is σ = 2616862248. Its totient is φ = 498128000.

The previous prime is 1245722407. The next prime is 1245722449. The reversal of 1245722420 is 242275421.

It can be written as a sum of positive squares in 4 ways, for example, as 565868944 + 679853476 = 23788^2 + 26074^2 .

It is a congruent number.

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, 68270 + ... + 84570.

It is an arithmetic number, because the mean of its divisors is an integer number (109035927).

Almost surely, 2^1245722420 is an apocalyptic number.

1245722420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245722420 is an abundant number, since it is smaller than the sum of its proper divisors (1371139828).

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

1245722420 is a wasteful number, since it uses less digits than its factorization.

1245722420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20131 (or 20129 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 29.

The square root of 1245722420 is about 35294.7931003994. The cubic root of 1245722420 is about 1075.9871718043.

Adding to 1245722420 its reverse (242275421), we get a palindrome (1487997841).

The spelling of 1245722420 in words is "one billion, two hundred forty-five million, seven hundred twenty-two thousand, four hundred twenty".