1642197 has 4 divisors (see below), whose sum is σ = 2189600. Its totient is φ = 1094796.

The previous prime is 1642187. The next prime is 1642211. The reversal of 1642197 is 7912461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1642197 - 2¹⁶ = 1576661 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273697 + ... + 273702.

It is an arithmetic number, because the mean of its divisors is an integer number (547400).

2^1642197 is an apocalyptic number.

It is an amenable number.

1642197 is a deficient number, since it is larger than the sum of its proper divisors (547403).

1642197 is an equidigital number, since it uses as much as digits as its factorization.

1642197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547402.

The product of its digits is 3024, while the sum is 30.

The square root of 1642197 is about 1281.4823447867. The cubic root of 1642197 is about 117.9800071462.

The spelling of 1642197 in words is "one million, six hundred forty-two thousand, one hundred ninety-seven".