39645442 has 8 divisors (see below), whose sum is σ = 60918732. Its totient is φ = 19339200.

The previous prime is 39645433. The next prime is 39645461. The reversal of 39645442 is 24454693.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39450961 + 194481 = 6281^2 + 441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×39645442² = 3143522142750728, which contains 22 as substring.

It is an unprimeable number.

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, 241659 + ... + 241822.

Almost surely, 2^39645442 is an apocalyptic number.

39645442 is a deficient number, since it is larger than the sum of its proper divisors (21273290).

39645442 is a wasteful number, since it uses less digits than its factorization.

39645442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483524.

The product of its digits is 103680, while the sum is 37.

The square root of 39645442 is about 6296.4626577150. The cubic root of 39645442 is about 340.9817128562.

The spelling of 39645442 in words is "thirty-nine million, six hundred forty-five thousand, four hundred forty-two".