8400121 has 8 divisors (see below), whose sum is σ = 8654688. Its totient is φ = 8148000.

The previous prime is 8400097. The next prime is 8400131. The reversal of 8400121 is 1210048.

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 8400121 - 2¹⁷ = 8269049 is a prime.

It is an Ulam number.

It is a Duffinian number.

8400121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8400095 and 8400104.

It is not an unprimeable number, because it can be changed into a prime (8400131) 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, 8166 + ... + 9136.

It is an arithmetic number, because the mean of its divisors is an integer number (1081836).

Almost surely, 2^8400121 is an apocalyptic number.

It is an amenable number.

8400121 is a deficient number, since it is larger than the sum of its proper divisors (254567).

8400121 is a wasteful number, since it uses less digits than its factorization.

8400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 8400121 is about 2898.2962236459. The cubic root of 8400121 is about 203.2802474215.

Adding to 8400121 its reverse (1210048), we get a palindrome (9610169).

The spelling of 8400121 in words is "eight million, four hundred thousand, one hundred twenty-one".