1309457 has 4 divisors (see below), whose sum is σ = 1324260. Its totient is φ = 1294656.

The previous prime is 1309421. The next prime is 1309463. The reversal of 1309457 is 7549031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 602176 + 707281 = 776^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309457 - 2¹⁸ = 1047313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7268 + ... + 7445.

It is an arithmetic number, because the mean of its divisors is an integer number (331065).

2^1309457 is an apocalyptic number.

It is an amenable number.

1309457 is a deficient number, since it is larger than the sum of its proper divisors (14803).

1309457 is an equidigital number, since it uses as much as digits as its factorization.

1309457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14802.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 1309457 is about 1144.3150789883. The cubic root of 1309457 is about 109.4032979297.

The spelling of 1309457 in words is "one million, three hundred nine thousand, four hundred fifty-seven".