2045642 has 4 divisors (see below), whose sum is σ = 3068466. Its totient is φ = 1022820.

The previous prime is 2045629. The next prime is 2045647. The reversal of 2045642 is 2465402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1466521 + 579121 = 1211^2 + 761^2 .

It is not an unprimeable number, because it can be changed into a prime (2045647) 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 as a sum of consecutive naturals, namely, 511409 + ... + 511412.

2^2045642 is an apocalyptic number.

2045642 is a deficient number, since it is larger than the sum of its proper divisors (1022824).

2045642 is a wasteful number, since it uses less digits than its factorization.

2045642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022823.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2045642 is about 1430.2594170290. The cubic root of 2045642 is about 126.9433272674.

The spelling of 2045642 in words is "two million, forty-five thousand, six hundred forty-two".