39993645 has 16 divisors (see below), whose sum is σ = 64481472. Its totient is φ = 21166080.

The previous prime is 39993643. The next prime is 39993647. The reversal of 39993645 is 54639993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (39993643) and next prime (39993647).

It is not a de Polignac number, because 39993645 - 2¹ = 39993643 is a prime.

It is a super-3 number, since 3×39993645³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39993594 and 39993603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39993643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8212 + ... + 12141.

It is an arithmetic number, because the mean of its divisors is an integer number (4030092).

Almost surely, 2^39993645 is an apocalyptic number.

It is an amenable number.

39993645 is a deficient number, since it is larger than the sum of its proper divisors (24487827).

39993645 is a wasteful number, since it uses less digits than its factorization.

39993645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20492.

The product of its digits is 787320, while the sum is 48.

The square root of 39993645 is about 6324.0528935169. The cubic root of 39993645 is about 341.9770768809.

The spelling of 39993645 in words is "thirty-nine million, nine hundred ninety-three thousand, six hundred forty-five".