1242320172 has 24 divisors (see below), whose sum is σ = 2969449392. Its totient is φ = 404006400.

The previous prime is 1242320161. The next prime is 1242320173. The reversal of 1242320172 is 2710232421.

It is not an unprimeable number, because it can be changed into a prime (1242320173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1262029 + ... + 1263012.

It is an arithmetic number, because the mean of its divisors is an integer number (123727058).

Almost surely, 2^1242320172 is an apocalyptic number.

1242320172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1242320172 is an abundant number, since it is smaller than the sum of its proper divisors (1727129220).

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

1242320172 is a wasteful number, since it uses less digits than its factorization.

1242320172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525089 (or 2525087 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 1242320172 is about 35246.5625558011. The cubic root of 1242320172 is about 1075.0067198426.

Adding to 1242320172 its reverse (2710232421), we get a palindrome (3952552593).

The spelling of 1242320172 in words is "one billion, two hundred forty-two million, three hundred twenty thousand, one hundred seventy-two".