1242445 has 16 divisors (see below), whose sum is σ = 1617408. Its totient is φ = 912640.

The previous prime is 1242421. The next prime is 1242457. The reversal of 1242445 is 5442421.

It is a happy number.

It is not a de Polignac number, because 1242445 - 2⁵ = 1242413 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3840 + ... + 4150.

It is an arithmetic number, because the mean of its divisors is an integer number (101088).

2^1242445 is an apocalyptic number.

It is an amenable number.

1242445 is a deficient number, since it is larger than the sum of its proper divisors (374963).

1242445 is a wasteful number, since it uses less digits than its factorization.

1242445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380.

The product of its digits is 1280, while the sum is 22.

The square root of 1242445 is about 1114.6501693357. The cubic root of 1242445 is about 107.5042724100.

Adding to 1242445 its reverse (5442421), we get a palindrome (6684866).

The spelling of 1242445 in words is "one million, two hundred forty-two thousand, four hundred forty-five".