1645142 has 4 divisors (see below), whose sum is σ = 2467716. Its totient is φ = 822570.

The previous prime is 1645129. The next prime is 1645151. The reversal of 1645142 is 2415461.

1645142 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2415461 = 1291 ⋅1871.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411284 + ... + 411287.

It is an arithmetic number, because the mean of its divisors is an integer number (616929).

2^1645142 is an apocalyptic number.

1645142 is a deficient number, since it is larger than the sum of its proper divisors (822574).

1645142 is an equidigital number, since it uses as much as digits as its factorization.

1645142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822573.

The product of its digits is 960, while the sum is 23.

The square root of 1645142 is about 1282.6308900069. The cubic root of 1645142 is about 118.0504906975.

The spelling of 1645142 in words is "one million, six hundred forty-five thousand, one hundred forty-two".