40421958 has 16 divisors (see below), whose sum is σ = 80917056. Its totient is φ = 13461800.

The previous prime is 40421957. The next prime is 40421999. The reversal of 40421958 is 85912404.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40421957) 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 7 ways as a sum of consecutive naturals, for example, 6385 + ... + 11027.

It is an arithmetic number, because the mean of its divisors is an integer number (5057316).

Almost surely, 2^40421958 is an apocalyptic number.

40421958 is an abundant number, since it is smaller than the sum of its proper divisors (40495098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40421958 is a wasteful number, since it uses less digits than its factorization.

40421958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6099.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 40421958 is about 6357.8265154060. The cubic root of 40421958 is about 343.1935487347.

The spelling of 40421958 in words is "forty million, four hundred twenty-one thousand, nine hundred fifty-eight".