39739785645 has 32 divisors (see below), whose sum is σ = 72987199488. Its totient is φ = 18086718528.

The previous prime is 39739785629. The next prime is 39739785653. The reversal of 39739785645 is 54658793793.

It is not a de Polignac number, because 39739785645 - 2⁴ = 39739785629 is a prime.

It is a super-3 number, since 3×39739785645³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 809809 + ... + 857478.

It is an arithmetic number, because the mean of its divisors is an integer number (2280849984).

Almost surely, 2^39739785645 is an apocalyptic number.

39739785645 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39739785645 is a deficient number, since it is larger than the sum of its proper divisors (33247413843).

39739785645 is a wasteful number, since it uses less digits than its factorization.

39739785645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667529.

The product of its digits is 171460800, while the sum is 66.

The spelling of 39739785645 in words is "thirty-nine billion, seven hundred thirty-nine million, seven hundred eighty-five thousand, six hundred forty-five".