39991045 has 8 divisors (see below), whose sum is σ = 48255480. Its totient is φ = 31815360.

The previous prime is 39991033. The next prime is 39991057. The reversal of 39991045 is 54019993.

It is an interprime number because it is at equal distance from previous prime (39991033) and next prime (39991057).

It can be written as a sum of positive squares in 4 ways, for example, as 5157441 + 34833604 = 2271^2 + 5902^2 .

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

It is not a de Polignac number, because 39991045 - 2⁷ = 39990917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39990989 and 39991007.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 21190 + ... + 22999.

It is an arithmetic number, because the mean of its divisors is an integer number (6031935).

Almost surely, 2^39991045 is an apocalyptic number.

It is an amenable number.

39991045 is a deficient number, since it is larger than the sum of its proper divisors (8264435).

39991045 is a wasteful number, since it uses less digits than its factorization.

39991045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44375.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 39991045 is about 6323.8473257978. The cubic root of 39991045 is about 341.9696660396.

The spelling of 39991045 in words is "thirty-nine million, nine hundred ninety-one thousand, forty-five".