1642257 has 6 divisors (see below), whose sum is σ = 2372162. Its totient is φ = 1094832.

The previous prime is 1642247. The next prime is 1642259. The reversal of 1642257 is 7522461.

It can be written as a sum of positive squares in only one way, i.e., 1640961 + 1296 = 1281^2 + 36^2 .

It is not a de Polignac number, because 1642257 - 2¹⁶ = 1576721 is a prime.

It is a Duffinian number.

1642257 is a lucky number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1642257.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642259) 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, 91228 + ... + 91245.

2^1642257 is an apocalyptic number.

It is an amenable number.

1642257 is a deficient number, since it is larger than the sum of its proper divisors (729905).

1642257 is a wasteful number, since it uses less digits than its factorization.

1642257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182479 (or 182476 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 1642257 is about 1281.5057549617. The cubic root of 1642257 is about 117.9814439844.

The spelling of 1642257 in words is "one million, six hundred forty-two thousand, two hundred fifty-seven".