390121 has 4 divisors (see below), whose sum is σ = 391552. Its totient is φ = 388692.

The previous prime is 390119. The next prime is 390151. The reversal of 390121 is 121093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121093 = 7 ⋅17299.

It is a cyclic number.

It is not a de Polignac number, because 390121 - 2¹ = 390119 is a prime.

It is a Duffinian number.

390121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 390095 and 390104.

It is not an unprimeable number, because it can be changed into a prime (390101) 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 3 ways as a sum of consecutive naturals, for example, 165 + ... + 898.

It is an arithmetic number, because the mean of its divisors is an integer number (97888).

2³⁹⁰¹²¹ is an apocalyptic number.

It is an amenable number.

390121 is a deficient number, since it is larger than the sum of its proper divisors (1431).

390121 is a wasteful number, since it uses less digits than its factorization.

390121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 390121 is about 624.5966698598. The cubic root of 390121 is about 73.0689908856.

The spelling of 390121 in words is "three hundred ninety thousand, one hundred twenty-one".