1242345 has 32 divisors (see below), whose sum is σ = 2241792. Its totient is φ = 582912.

The previous prime is 1242317. The next prime is 1242347. The reversal of 1242345 is 5432421.

It is not a de Polignac number, because 1242345 - 2⁷ = 1242217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242347) 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, 4347 + ... + 4623.

It is an arithmetic number, because the mean of its divisors is an integer number (70056).

2^1242345 is an apocalyptic number.

1242345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242345 is a deficient number, since it is larger than the sum of its proper divisors (999447).

1242345 is a wasteful number, since it uses less digits than its factorization.

1242345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321.

The product of its digits is 960, while the sum is 21.

The square root of 1242345 is about 1114.6053113098. The cubic root of 1242345 is about 107.5013881198.

Adding to 1242345 its reverse (5432421), we get a palindrome (6674766).

The spelling of 1242345 in words is "one million, two hundred forty-two thousand, three hundred forty-five".