1425921 has 8 divisors (see below), whose sum is σ = 2172864. Its totient is φ = 814800.

The previous prime is 1425917. The next prime is 1425929. The reversal of 1425921 is 1295241.

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

It is not a de Polignac number, because 1425921 - 2² = 1425917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1425891 and 1425900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1425929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33930 + ... + 33971.

It is an arithmetic number, because the mean of its divisors is an integer number (271608).

2^1425921 is an apocalyptic number.

It is an amenable number.

1425921 is a deficient number, since it is larger than the sum of its proper divisors (746943).

1425921 is an equidigital number, since it uses as much as digits as its factorization.

1425921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67911.

The product of its digits is 720, while the sum is 24.

The square root of 1425921 is about 1194.1193407696. The cubic root of 1425921 is about 112.5550940024. Note that the first 3 decimals are identical.

It can be divided in two parts, 1425 and 921, that added together give a triangular number (2346 = T₆₈).

The spelling of 1425921 in words is "one million, four hundred twenty-five thousand, nine hundred twenty-one".