400013121 has 8 divisors (see below), whose sum is σ = 533625120. Its totient is φ = 266538272.

The previous prime is 400013113. The next prime is 400013123. The reversal of 400013121 is 121310004.

It is a happy number.

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 400013121 - 2³ = 400013113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400013097 and 400013106.

It is not an unprimeable number, because it can be changed into a prime (400013123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27276 + ... + 39293.

It is an arithmetic number, because the mean of its divisors is an integer number (66703140).

Almost surely, 2^400013121 is an apocalyptic number.

It is an amenable number.

400013121 is a deficient number, since it is larger than the sum of its proper divisors (133611999).

400013121 is a wasteful number, since it uses less digits than its factorization.

400013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68575.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 400013121 is about 20000.3280223100. The cubic root of 400013121 is about 736.8143560029.

Adding to 400013121 its reverse (121310004), we get a palindrome (521323125).

The spelling of 400013121 in words is "four hundred million, thirteen thousand, one hundred twenty-one".