1242985920 has 224 divisors, whose sum is σ = 4445300736. Its totient is φ = 291532800.

The previous prime is 1242985883. The next prime is 1242985927. The reversal of 1242985920 is 295892421.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242985927) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 325462 + ... + 329258.

Almost surely, 2^1242985920 is an apocalyptic number.

1242985920 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 1242985920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222650368).

1242985920 is an abundant number, since it is smaller than the sum of its proper divisors (3202314816).

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

1242985920 is a wasteful number, since it uses less digits than its factorization.

1242985920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859 (or 3849 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1242985920 is about 35256.0054458811. The cubic root of 1242985920 is about 1075.1987143019.

The spelling of 1242985920 in words is "one billion, two hundred forty-two million, nine hundred eighty-five thousand, nine hundred twenty".