1245775420 has 24 divisors (see below), whose sum is σ = 2671792704. Its totient is φ = 487707456.

The previous prime is 1245775357. The next prime is 1245775423. The reversal of 1245775420 is 245775421.

It is a self number, because there is not a number n which added to its sum of digits gives 1245775420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245775423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661707 + ... + 663586.

It is an arithmetic number, because the mean of its divisors is an integer number (111324696).

Almost surely, 2^1245775420 is an apocalyptic number.

1245775420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245775420 is an abundant number, since it is smaller than the sum of its proper divisors (1426017284).

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

1245775420 is a wasteful number, since it uses less digits than its factorization.

1245775420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325349 (or 1325347 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 37.

The square root of 1245775420 is about 35295.5439113778. The cubic root of 1245775420 is about 1076.0024310923.

Subtracting from 1245775420 its reverse (245775421), we obtain a palindrome (999999999).

The spelling of 1245775420 in words is "one billion, two hundred forty-five million, seven hundred seventy-five thousand, four hundred twenty".