1421905 has 8 divisors (see below), whose sum is σ = 1722600. Its totient is φ = 1126656.

The previous prime is 1421867. The next prime is 1421909. The reversal of 1421905 is 5091241.

It can be written as a sum of positive squares in 4 ways, for example, as 229441 + 1192464 = 479^2 + 1092^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421905 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1421909) 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, 760 + ... + 1849.

It is an arithmetic number, because the mean of its divisors is an integer number (215325).

2^1421905 is an apocalyptic number.

It is an amenable number.

1421905 is a deficient number, since it is larger than the sum of its proper divisors (300695).

1421905 is a wasteful number, since it uses less digits than its factorization.

1421905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1421905 is about 1192.4365811229. The cubic root of 1421905 is about 112.4493269732.

The spelling of 1421905 in words is "one million, four hundred twenty-one thousand, nine hundred five".