1457721 has 6 divisors (see below), whose sum is σ = 2105610. Its totient is φ = 971808.

The previous prime is 1457683. The next prime is 1457741. The reversal of 1457721 is 1277541.

It can be written as a sum of positive squares in only one way, i.e., 1022121 + 435600 = 1011^2 + 660^2 .

It is not a de Polignac number, because 1457721 - 2¹¹ = 1455673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1457741) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 80976 + ... + 80993.

It is an arithmetic number, because the mean of its divisors is an integer number (350935).

2^1457721 is an apocalyptic number.

It is an amenable number.

1457721 is a deficient number, since it is larger than the sum of its proper divisors (647889).

1457721 is a wasteful number, since it uses less digits than its factorization.

1457721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161975 (or 161972 counting only the distinct ones).

The product of its digits is 1960, while the sum is 27.

The square root of 1457721 is about 1207.3611721436. The cubic root of 1457721 is about 113.3856611490.

The spelling of 1457721 in words is "one million, four hundred fifty-seven thousand, seven hundred twenty-one".