40553921 has 4 divisors (see below), whose sum is σ = 41862144. Its totient is φ = 39245700.

The previous prime is 40553917. The next prime is 40553941. The reversal of 40553921 is 12935504.

40553921 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.

It is a cyclic number.

It is not a de Polignac number, because 40553921 - 2² = 40553917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40553941) 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, 654065 + ... + 654126.

It is an arithmetic number, because the mean of its divisors is an integer number (10465536).

Almost surely, 2^40553921 is an apocalyptic number.

It is an amenable number.

40553921 is a deficient number, since it is larger than the sum of its proper divisors (1308223).

40553921 is a wasteful number, since it uses less digits than its factorization.

40553921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308222.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 40553921 is about 6368.1960553990. The cubic root of 40553921 is about 343.5666104551.

The spelling of 40553921 in words is "forty million, five hundred fifty-three thousand, nine hundred twenty-one".