39040921 has 4 divisors (see below), whose sum is σ = 39067344. Its totient is φ = 39014500.

The previous prime is 39040919. The next prime is 39040933. The reversal of 39040921 is 12904093.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 39040921 - 2¹ = 39040919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39040921.

It is not an unprimeable number, because it can be changed into a prime (39040951) 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, 10855 + ... + 13996.

It is an arithmetic number, because the mean of its divisors is an integer number (9766836).

Almost surely, 2^39040921 is an apocalyptic number.

It is an amenable number.

39040921 is a deficient number, since it is larger than the sum of its proper divisors (26423).

39040921 is a wasteful number, since it uses less digits than its factorization.

39040921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26422.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 39040921 is about 6248.2734415197. The cubic root of 39040921 is about 339.2397111869.

It can be divided in two parts, 3904092 and 1, that added together give a palindrome (3904093).

The spelling of 39040921 in words is "thirty-nine million, forty thousand, nine hundred twenty-one".