1245709920 has 576 divisors, whose sum is σ = 5161605120. Its totient is φ = 245846016.

The previous prime is 1245709897. The next prime is 1245709973. The reversal of 1245709920 is 299075421.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15768441 + ... + 15768519.

It is an arithmetic number, because the mean of its divisors is an integer number (8961120).

Almost surely, 2^1245709920 is an apocalyptic number.

1245709920 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 1245709920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2580802560).

1245709920 is an abundant number, since it is smaller than the sum of its proper divisors (3915895200).

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

1245709920 is a wasteful number, since it uses less digits than its factorization.

1245709920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1245709920 is about 35294.6160200108. The cubic root of 1245709920 is about 1075.9835728526.

The spelling of 1245709920 in words is "one billion, two hundred forty-five million, seven hundred nine thousand, nine hundred twenty".