1245457 has 8 divisors (see below), whose sum is σ = 1311912. Its totient is φ = 1180800.

The previous prime is 1245451. The next prime is 1245479. The reversal of 1245457 is 7545421.

It is a Cunningham number, because it is equal to 1116²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 59536 + 1185921 = 244^2 + 1089^2 .

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

It is not a de Polignac number, because 1245457 - 2³ = 1245449 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1107 + ... + 1927.

It is an arithmetic number, because the mean of its divisors is an integer number (163989).

2^1245457 is an apocalyptic number.

It is an amenable number.

1245457 is a deficient number, since it is larger than the sum of its proper divisors (66455).

1245457 is an equidigital number, since it uses as much as digits as its factorization.

1245457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899.

The product of its digits is 5600, while the sum is 28.

The square root of 1245457 is about 1116.0004480286. Note that the first 3 decimals coincide. The cubic root of 1245457 is about 107.5910747930.

The spelling of 1245457 in words is "one million, two hundred forty-five thousand, four hundred fifty-seven".