1242745980 has 144 divisors (see below), whose sum is σ = 4110543360. Its totient is φ = 274803840.

The previous prime is 1242745979. The next prime is 1242745981. The reversal of 1242745980 is 895472421.

It is an interprime number because it is at equal distance from previous prime (1242745979) and next prime (1242745981).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242745981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 402081 + ... + 405159.

It is an arithmetic number, because the mean of its divisors is an integer number (28545440).

Almost surely, 2^1242745980 is an apocalyptic number.

1242745980 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 1242745980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2055271680).

1242745980 is an abundant number, since it is smaller than the sum of its proper divisors (2867797380).

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

1242745980 is a wasteful number, since it uses less digits than its factorization.

1242745980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 1242745980 is about 35252.6024571236. The cubic root of 1242745980 is about 1075.1295261271.

The spelling of 1242745980 in words is "one billion, two hundred forty-two million, seven hundred forty-five thousand, nine hundred eighty".