40421155 has 16 divisors (see below), whose sum is σ = 51559200. Its totient is φ = 30316032.

The previous prime is 40421153. The next prime is 40421177. The reversal of 40421155 is 55112404.

It is not a de Polignac number, because 40421155 - 2¹ = 40421153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40421153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25321 + ... + 26869.

It is an arithmetic number, because the mean of its divisors is an integer number (3222450).

Almost surely, 2^40421155 is an apocalyptic number.

40421155 is a deficient number, since it is larger than the sum of its proper divisors (11138045).

40421155 is a wasteful number, since it uses less digits than its factorization.

40421155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 40421155 is about 6357.7633645803. The cubic root of 40421155 is about 343.1912761560.

Adding to 40421155 its reverse (55112404), we get a palindrome (95533559).

The spelling of 40421155 in words is "forty million, four hundred twenty-one thousand, one hundred fifty-five".