1642369 has 4 divisors (see below), whose sum is σ = 1646596. Its totient is φ = 1638144.

The previous prime is 1642363. The next prime is 1642373. The reversal of 1642369 is 9632461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9632461 = 107 ⋅90023.

It can be written as a sum of positive squares in 2 ways, for example, as 238144 + 1404225 = 488^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642369 - 2¹³ = 1634177 is a prime.

It is a super-2 number, since 2×1642369² = 5394751864322, which contains 22 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 6⁴ + 4 + 2³ + 3¹³ + 6⁶ + 9² .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1642369.

It is not an unprimeable number, because it can be changed into a prime (1642363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1464 + ... + 2329.

It is an arithmetic number, because the mean of its divisors is an integer number (411649).

2^1642369 is an apocalyptic number.

It is an amenable number.

1642369 is a deficient number, since it is larger than the sum of its proper divisors (4227).

1642369 is an equidigital number, since it uses as much as digits as its factorization.

1642369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226.

The product of its digits is 7776, while the sum is 31.

The square root of 1642369 is about 1281.5494528109. The cubic root of 1642369 is about 117.9841259887.

The spelling of 1642369 in words is "one million, six hundred forty-two thousand, three hundred sixty-nine".