1242139444 has 48 divisors (see below), whose sum is σ = 2740663296. Its totient is φ = 479404800.

The previous prime is 1242139441. The next prime is 1242139471. The reversal of 1242139444 is 4449312421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242139441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26692 + ... + 56539.

It is an arithmetic number, because the mean of its divisors is an integer number (57097152).

Almost surely, 2^1242139444 is an apocalyptic number.

1242139444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1242139444 is an abundant number, since it is smaller than the sum of its proper divisors (1498523852).

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

1242139444 is a wasteful number, since it uses less digits than its factorization.

1242139444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83296 (or 83294 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 1242139444 is about 35243.9986948133. The cubic root of 1242139444 is about 1074.9545880222.

The spelling of 1242139444 in words is "one billion, two hundred forty-two million, one hundred thirty-nine thousand, four hundred forty-four".