1242320357 has 4 divisors (see below), whose sum is σ = 1285159020. Its totient is φ = 1199481696.

The previous prime is 1242320341. The next prime is 1242320363. The reversal of 1242320357 is 7530232421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 506880196 + 735440161 = 22514^2 + 27119^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242320357 - 2⁴ = 1242320341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 42838633 = 1242320357 / (1 + 2 + 4 + 2 + 3 + 2 + 0 + 3 + 5 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242320557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21419288 + ... + 21419345.

It is an arithmetic number, because the mean of its divisors is an integer number (321289755).

Almost surely, 2^1242320357 is an apocalyptic number.

It is an amenable number.

1242320357 is a deficient number, since it is larger than the sum of its proper divisors (42838663).

1242320357 is an equidigital number, since it uses as much as digits as its factorization.

1242320357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42838662.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 1242320357 is about 35246.5651801704. The cubic root of 1242320357 is about 1075.0067732041.

Adding to 1242320357 its reverse (7530232421), we get a palindrome (8772552778).

The spelling of 1242320357 in words is "one billion, two hundred forty-two million, three hundred twenty thousand, three hundred fifty-seven".