1242645 has 16 divisors (see below), whose sum is σ = 2042880. Its totient is φ = 644544.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242645 is 5462421.

1242645 = 348² + 349² + ... + 357².

It is not a de Polignac number, because 1242645 - 2¹ = 1242643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565 + ... + 1674.

It is an arithmetic number, because the mean of its divisors is an integer number (127680).

2^1242645 is an apocalyptic number.

1242645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242645 is a deficient number, since it is larger than the sum of its proper divisors (800235).

1242645 is a wasteful number, since it uses less digits than its factorization.

1242645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284.

The product of its digits is 1920, while the sum is 24.

The square root of 1242645 is about 1114.7398799720. The cubic root of 1242645 is about 107.5100405260.

The spelling of 1242645 in words is "one million, two hundred forty-two thousand, six hundred forty-five".