40788921 has 4 divisors (see below), whose sum is σ = 54385232. Its totient is φ = 27192612.

The previous prime is 40788907. The next prime is 40788929. The reversal of 40788921 is 12988704.

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 not a de Polignac number, because 40788921 - 2⁵ = 40788889 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 40788921.

It is not an unprimeable number, because it can be changed into a prime (40788929) 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, 6798151 + ... + 6798156.

It is an arithmetic number, because the mean of its divisors is an integer number (13596308).

Almost surely, 2^40788921 is an apocalyptic number.

It is an amenable number.

40788921 is a deficient number, since it is larger than the sum of its proper divisors (13596311).

40788921 is a wasteful number, since it uses less digits than its factorization.

40788921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13596310.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 40788921 is about 6386.6204678218. The cubic root of 40788921 is about 344.2289607205.

The spelling of 40788921 in words is "forty million, seven hundred eighty-eight thousand, nine hundred twenty-one".