40420121 has 8 divisors (see below), whose sum is σ = 46489920. Its totient is φ = 34424208.

The previous prime is 40420111. The next prime is 40420123. The reversal of 40420121 is 12102404.

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

It is not a de Polignac number, because 40420121 - 2⁶ = 40420057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40420096 and 40420105.

It is not an unprimeable number, because it can be changed into a prime (40420123) 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, 17291 + ... + 19488.

It is an arithmetic number, because the mean of its divisors is an integer number (5811240).

Almost surely, 2^40420121 is an apocalyptic number.

It is an amenable number.

40420121 is a deficient number, since it is larger than the sum of its proper divisors (6069799).

40420121 is a wasteful number, since it uses less digits than its factorization.

40420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36943.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 40420121 is about 6357.6820461549. The cubic root of 40420121 is about 343.1883497774.

Adding to 40420121 its reverse (12102404), we get a palindrome (52522525).

The spelling of 40420121 in words is "forty million, four hundred twenty thousand, one hundred twenty-one".