40402121 has 8 divisors (see below), whose sum is σ = 40966464. Its totient is φ = 39841200.

The previous prime is 40402091. The next prime is 40402123. The reversal of 40402121 is 12120404.

40402121 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 40402121 - 2⁶ = 40402057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40402096 and 40402105.

It is not an unprimeable number, because it can be changed into a prime (40402123) 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, 30356 + ... + 31658.

It is an arithmetic number, because the mean of its divisors is an integer number (5120808).

Almost surely, 2^40402121 is an apocalyptic number.

It is an amenable number.

40402121 is a deficient number, since it is larger than the sum of its proper divisors (564343).

40402121 is a wasteful number, since it uses less digits than its factorization.

40402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711.

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

The square root of 40402121 is about 6356.2662782486. The cubic root of 40402121 is about 343.1373990187.

Adding to 40402121 its reverse (12120404), we get a palindrome (52522525).

The spelling of 40402121 in words is "forty million, four hundred two thousand, one hundred twenty-one".