403890121 has 4 divisors (see below), whose sum is σ = 405206032. Its totient is φ = 402574212.

The previous prime is 403890083. The next prime is 403890127. The reversal of 403890121 is 121098304.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 403890121 - 2²¹ = 401792969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 403890121.

It is not an unprimeable number, because it can be changed into a prime (403890127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657495 + ... + 658108.

It is an arithmetic number, because the mean of its divisors is an integer number (101301508).

Almost surely, 2^403890121 is an apocalyptic number.

It is an amenable number.

403890121 is a deficient number, since it is larger than the sum of its proper divisors (1315911).

403890121 is a wasteful number, since it uses less digits than its factorization.

403890121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315910.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 403890121 is about 20097.0177140789. The cubic root of 403890121 is about 739.1871528717.

The spelling of 403890121 in words is "four hundred three million, eight hundred ninety thousand, one hundred twenty-one".