1425721 has 16 divisors (see below), whose sum is σ = 1663488. Its totient is φ = 1209600.

The previous prime is 1425707. The next prime is 1425733. The reversal of 1425721 is 1275241.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1425721 - 2¹⁵ = 1392953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1425692 and 1425701.

It is not an unprimeable number, because it can be changed into a prime (1425791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12561 + ... + 12673.

It is an arithmetic number, because the mean of its divisors is an integer number (103968).

2^1425721 is an apocalyptic number.

1425721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1425721 is a deficient number, since it is larger than the sum of its proper divisors (237767).

1425721 is a wasteful number, since it uses less digits than its factorization.

1425721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192.

The product of its digits is 560, while the sum is 22.

The square root of 1425721 is about 1194.0355941093. The cubic root of 1425721 is about 112.5498314221.

The spelling of 1425721 in words is "one million, four hundred twenty-five thousand, seven hundred twenty-one".