1242369 has 6 divisors (see below), whose sum is σ = 1794546. Its totient is φ = 828240.

The previous prime is 1242361. The next prime is 1242379. The reversal of 1242369 is 9632421.

It can be written as a sum of positive squares in only one way, i.e., 1238769 + 3600 = 1113^2 + 60^2 .

It is not a de Polignac number, because 1242369 - 2³ = 1242361 is a prime.

It is a super-2 number, since 2×1242369² = 3086961464322, which contains 22 as substring.

It is a d-powerful number, because it can be written as 1 + 2¹³ + 4 + 2¹⁹ + 3¹¹ + 6⁴ + 9⁶ .

It is a Curzon number.

1242369 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1242361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69012 + ... + 69029.

It is an arithmetic number, because the mean of its divisors is an integer number (299091).

2^1242369 is an apocalyptic number.

It is an amenable number.

1242369 is a deficient number, since it is larger than the sum of its proper divisors (552177).

1242369 is a wasteful number, since it uses less digits than its factorization.

1242369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138047 (or 138044 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1242369 is about 1114.6160774006. The cubic root of 1242369 is about 107.5020803636.

The spelling of 1242369 in words is "one million, two hundred forty-two thousand, three hundred sixty-nine".