1642238 has 16 divisors (see below), whose sum is σ = 2688336. Its totient is φ = 747840.

The previous prime is 1642231. The next prime is 1642243. The reversal of 1642238 is 8322461.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1778 + ... + 2538.

It is an arithmetic number, because the mean of its divisors is an integer number (168021).

2^1642238 is an apocalyptic number.

1642238 is a deficient number, since it is larger than the sum of its proper divisors (1046098).

1642238 is a wasteful number, since it uses less digits than its factorization.

1642238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its digits is 2304, while the sum is 26.

The square root of 1642238 is about 1281.4983417859. The cubic root of 1642238 is about 117.9809889894.

Adding to 1642238 its reverse (8322461), we get a palindrome (9964699).

The spelling of 1642238 in words is "one million, six hundred forty-two thousand, two hundred thirty-eight".