1642431 has 12 divisors (see below), whose sum is σ = 2547672. Its totient is φ = 938448.

The previous prime is 1642423. The next prime is 1642441. The reversal of 1642431 is 1342461.

It is not a de Polignac number, because 1642431 - 2³ = 1642423 is a prime.

It is a super-2 number, since 2×1642431² = 5395159179522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1642398 and 1642407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5440 + ... + 5733.

It is an arithmetic number, because the mean of its divisors is an integer number (212306).

2^1642431 is an apocalyptic number.

1642431 is a deficient number, since it is larger than the sum of its proper divisors (905241).

1642431 is a wasteful number, since it uses less digits than its factorization.

1642431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11190 (or 11183 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 1642431 is about 1281.5736420511. The cubic root of 1642431 is about 117.9856106173.

Adding to 1642431 its reverse (1342461), we get a palindrome (2984892).

The spelling of 1642431 in words is "one million, six hundred forty-two thousand, four hundred thirty-one".