39755981 has 4 divisors (see below), whose sum is σ = 41038464. Its totient is φ = 38473500.

The previous prime is 39755959. The next prime is 39755993. The reversal of 39755981 is 18955793.

39755981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18955793 = 71 ⋅266983.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39755981 is a prime.

It is a super-2 number, since 2×39755981² = 3161076050544722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39755941) 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 in 3 ways as a sum of consecutive naturals, for example, 641195 + ... + 641256.

It is an arithmetic number, because the mean of its divisors is an integer number (10259616).

Almost surely, 2^39755981 is an apocalyptic number.

39755981 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

39755981 is a deficient number, since it is larger than the sum of its proper divisors (1282483).

39755981 is a wasteful number, since it uses less digits than its factorization.

39755981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282482.

The product of its digits is 340200, while the sum is 47.

The square root of 39755981 is about 6305.2344127717. The cubic root of 39755981 is about 341.2983259750.

The spelling of 39755981 in words is "thirty-nine million, seven hundred fifty-five thousand, nine hundred eighty-one".