1245229920 has 288 divisors, whose sum is σ = 4679700480. Its totient is φ = 299013120.

The previous prime is 1245229919. The next prime is 1245229943. The reversal of 1245229920 is 299225421.

1245229920 is a `hidden beast` number, since 1 + 24 + 522 + 99 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2011371 + ... + 2011989.

It is an arithmetic number, because the mean of its divisors is an integer number (16248960).

Almost surely, 2^1245229920 is an apocalyptic number.

1245229920 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 1245229920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2339850240).

1245229920 is an abundant number, since it is smaller than the sum of its proper divisors (3434470560).

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

1245229920 is a wasteful number, since it uses less digits than its factorization.

1245229920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1245229920 is about 35287.8154608641. The cubic root of 1245229920 is about 1075.8453548889.

The spelling of 1245229920 in words is "one billion, two hundred forty-five million, two hundred twenty-nine thousand, nine hundred twenty".