1242340331 has 32 divisors (see below), whose sum is σ = 1424148480. Its totient is φ = 1077221376.

The previous prime is 1242340273. The next prime is 1242340357. The reversal of 1242340331 is 1330432421.

It is not a de Polignac number, because 1242340331 - 2²² = 1238146027 is a prime.

It is a super-2 number, since 2×1242340331² = 3086818996058379122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 1242340297 and 1242340306.

It is not an unprimeable number, because it can be changed into a prime (1242340361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1230755 + ... + 1231763.

It is an arithmetic number, because the mean of its divisors is an integer number (44504640).

Almost surely, 2^1242340331 is an apocalyptic number.

1242340331 is a deficient number, since it is larger than the sum of its proper divisors (181808149).

1242340331 is a wasteful number, since it uses less digits than its factorization.

1242340331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 1242340331 is about 35246.8485257902. The cubic root of 1242340331 is about 1075.0125344852.

Adding to 1242340331 its reverse (1330432421), we get a palindrome (2572772752).

The spelling of 1242340331 in words is "one billion, two hundred forty-two million, three hundred forty thousand, three hundred thirty-one".