40154221 has 4 divisors (see below), whose sum is σ = 42516252. Its totient is φ = 37792192.

The previous prime is 40154203. The next prime is 40154243. The reversal of 40154221 is 12245104.

40154221 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.

It can be written as a sum of positive squares in 2 ways, for example, as 23872996 + 16281225 = 4886^2 + 4035^2 .

It is a cyclic number.

It is not a de Polignac number, because 40154221 - 2⁵ = 40154189 is a prime.

It is a super-2 number, since 2×40154221² = 3224722928233682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40154281) 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, 1180990 + ... + 1181023.

It is an arithmetic number, because the mean of its divisors is an integer number (10629063).

Almost surely, 2^40154221 is an apocalyptic number.

It is an amenable number.

40154221 is a deficient number, since it is larger than the sum of its proper divisors (2362031).

40154221 is a wasteful number, since it uses less digits than its factorization.

40154221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362030.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 40154221 is about 6336.7358316408. The cubic root of 40154221 is about 342.4341493448.

Adding to 40154221 its reverse (12245104), we get a palindrome (52399325).

The spelling of 40154221 in words is "forty million, one hundred fifty-four thousand, two hundred twenty-one".