1245897920 has 28 divisors (see below), whose sum is σ = 2966795184. Its totient is φ = 498359040.

The previous prime is 1245897907. The next prime is 1245897931. The reversal of 1245897920 is 297985421.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1946396 + ... + 1947035.

Almost surely, 2^1245897920 is an apocalyptic number.

1245897920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245897920 is an abundant number, since it is smaller than the sum of its proper divisors (1720897264).

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

1245897920 is an equidigital number, since it uses as much as digits as its factorization.

1245897920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3893448 (or 3893438 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1245897920 is about 35297.2792152596. The cubic root of 1245897920 is about 1076.0376985451.

The spelling of 1245897920 in words is "one billion, two hundred forty-five million, eight hundred ninety-seven thousand, nine hundred twenty".