3645742 has 4 divisors (see below), whose sum is σ = 5468616. Its totient is φ = 1822870.

The previous prime is 3645737. The next prime is 3645749. The reversal of 3645742 is 2475463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2475463 = 59 ⋅41957.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911434 + ... + 911437.

It is an arithmetic number, because the mean of its divisors is an integer number (1367154).

Almost surely, 2^3645742 is an apocalyptic number.

3645742 is a deficient number, since it is larger than the sum of its proper divisors (1822874).

3645742 is a wasteful number, since it uses less digits than its factorization.

3645742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822873.

The product of its digits is 20160, while the sum is 31.

The square root of 3645742 is about 1909.3826227344. The cubic root of 3645742 is about 153.9082773084.

The spelling of 3645742 in words is "three million, six hundred forty-five thousand, seven hundred forty-two".