40420155 has 8 divisors (see below), whose sum is σ = 64672272. Its totient is φ = 21557408.

The previous prime is 40420147. The next prime is 40420157. The reversal of 40420155 is 55102404.

40420155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40420155 - 2³ = 40420147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40420157) 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 7 ways as a sum of consecutive naturals, for example, 1347324 + ... + 1347353.

It is an arithmetic number, because the mean of its divisors is an integer number (8084034).

Almost surely, 2^40420155 is an apocalyptic number.

40420155 is a deficient number, since it is larger than the sum of its proper divisors (24252117).

40420155 is a wasteful number, since it uses less digits than its factorization.

40420155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694685.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 40420155 is about 6357.6847200848. The cubic root of 40420155 is about 343.1884460034.

Adding to 40420155 its reverse (55102404), we get a palindrome (95522559).

The spelling of 40420155 in words is "forty million, four hundred twenty thousand, one hundred fifty-five".