40111921 has 4 divisors (see below), whose sum is σ = 40169844. Its totient is φ = 40054000.

The previous prime is 40111919. The next prime is 40111927. The reversal of 40111921 is 12911104.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37994896 + 2117025 = 6164^2 + 1455^2 .

It is a cyclic number.

It is not a de Polignac number, because 40111921 - 2¹ = 40111919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40111927) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27910 + ... + 29311.

It is an arithmetic number, because the mean of its divisors is an integer number (10042461).

Almost surely, 2^40111921 is an apocalyptic number.

It is an amenable number.

40111921 is a deficient number, since it is larger than the sum of its proper divisors (57923).

40111921 is an equidigital number, since it uses as much as digits as its factorization.

40111921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57922.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 40111921 is about 6333.3972716071. The cubic root of 40111921 is about 342.3138626645.

The spelling of 40111921 in words is "forty million, one hundred eleven thousand, nine hundred twenty-one".