39440991 has 4 divisors (see below), whose sum is σ = 52587992. Its totient is φ = 26293992.

The previous prime is 39440983. The next prime is 39441007. The reversal of 39440991 is 19904493.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 39440991 - 2³ = 39440983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39440911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6573496 + ... + 6573501.

It is an arithmetic number, because the mean of its divisors is an integer number (13146998).

Almost surely, 2^39440991 is an apocalyptic number.

39440991 is a deficient number, since it is larger than the sum of its proper divisors (13147001).

39440991 is a wasteful number, since it uses less digits than its factorization.

39440991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13147000.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 39440991 is about 6280.2062864209. The cubic root of 39440991 is about 340.3945563736.

The spelling of 39440991 in words is "thirty-nine million, four hundred forty thousand, nine hundred ninety-one".