1405121 has 4 divisors (see below), whose sum is σ = 1407744. Its totient is φ = 1402500.

The previous prime is 1405109. The next prime is 1405127. The reversal of 1405121 is 1215041.

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: 1215041 = 17 ⋅71473.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1405121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1405096 and 1405105.

It is not an unprimeable number, because it can be changed into a prime (1405127) 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, 185 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (351936).

2^1405121 is an apocalyptic number.

It is an amenable number.

1405121 is a deficient number, since it is larger than the sum of its proper divisors (2623).

1405121 is an equidigital number, since it uses as much as digits as its factorization.

1405121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1405121 is about 1185.3779987835. The cubic root of 1405121 is about 112.0051283791.

The spelling of 1405121 in words is "one million, four hundred five thousand, one hundred twenty-one".