1242945 has 56 divisors (see below), whose sum is σ = 2518272. Its totient is φ = 583200.

The previous prime is 1242937. The next prime is 1242947. The reversal of 1242945 is 5492421.

It is not a de Polignac number, because 1242945 - 2³ = 1242937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242947) 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 55 ways as a sum of consecutive naturals, for example, 40080 + ... + 40110.

2^1242945 is an apocalyptic number.

1242945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242945 is an abundant number, since it is smaller than the sum of its proper divisors (1275327).

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

1242945 is an equidigital number, since it uses as much as digits as its factorization.

1242945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65 (or 50 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1242945 is about 1114.8744323914. The cubic root of 1242945 is about 107.5186915398.

It can be divided in two parts, 1242 and 945, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1242945 in words is "one million, two hundred forty-two thousand, nine hundred forty-five".