40153921 has 4 divisors (see below), whose sum is σ = 40812244. Its totient is φ = 39495600.

The previous prime is 40153907. The next prime is 40153931. The reversal of 40153921 is 12935104.

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 1527696 + 38626225 = 1236^2 + 6215^2 .

It is a cyclic number.

It is not a de Polignac number, because 40153921 - 2⁵ = 40153889 is a prime.

It is a super-2 number, since 2×40153921² = 3224674743348482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40153901) 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, 329070 + ... + 329191.

It is an arithmetic number, because the mean of its divisors is an integer number (10203061).

Almost surely, 2^40153921 is an apocalyptic number.

It is an amenable number.

40153921 is a deficient number, since it is larger than the sum of its proper divisors (658323).

40153921 is an equidigital number, since it uses as much as digits as its factorization.

40153921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658322.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 40153921 is about 6336.7121601032. The cubic root of 40153921 is about 342.4332965453.

The spelling of 40153921 in words is "forty million, one hundred fifty-three thousand, nine hundred twenty-one".