1242031356 has 72 divisors (see below), whose sum is σ = 3343760784. Its totient is φ = 387371520.

The previous prime is 1242031331. The next prime is 1242031363. The reversal of 1242031356 is 6531302421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100011 + ... + 111741.

It is an arithmetic number, because the mean of its divisors is an integer number (46441122).

Almost surely, 2^1242031356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242031356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1671880392).

1242031356 is an abundant number, since it is smaller than the sum of its proper divisors (2101729428).

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

1242031356 is a wasteful number, since it uses less digits than its factorization.

1242031356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11931 (or 11926 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1242031356 is about 35242.4652372674. The cubic root of 1242031356 is about 1074.9234071263.

Adding to 1242031356 its reverse (6531302421), we get a palindrome (7773333777).

The spelling of 1242031356 in words is "one billion, two hundred forty-two million, thirty-one thousand, three hundred fifty-six".