1407721 has 6 divisors (see below), whose sum is σ = 1637610. Its totient is φ = 1206576.

The previous prime is 1407709. The next prime is 1407727. The reversal of 1407721 is 1277041.

It can be written as a sum of positive squares in only one way, i.e., 1132096 + 275625 = 1064^2 + 525^2 .

It is not a de Polignac number, because 1407721 - 2¹³ = 1399529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1407692 and 1407701.

It is not an unprimeable number, because it can be changed into a prime (1407727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14316 + ... + 14413.

It is an arithmetic number, because the mean of its divisors is an integer number (272935).

2^1407721 is an apocalyptic number.

It is an amenable number.

1407721 is a deficient number, since it is larger than the sum of its proper divisors (229889).

1407721 is an equidigital number, since it uses as much as digits as its factorization.

1407721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28743 (or 28736 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 1407721 is about 1186.4741885098. The cubic root of 1407721 is about 112.0741696219.

The spelling of 1407721 in words is "one million, four hundred seven thousand, seven hundred twenty-one".