1357397 has 4 divisors (see below), whose sum is σ = 1401216. Its totient is φ = 1313580.

The previous prime is 1357361. The next prime is 1357423. The reversal of 1357397 is 7937531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7937531 = 7 ⋅1133933.

It is a cyclic number.

It is not a de Polignac number, because 1357397 - 2⁶ = 1357333 is a prime.

It is a d-powerful number, because it can be written as 1 + 3 + 5 + 7⁴ + 3 + 9⁶ + 7⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1357337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21863 + ... + 21924.

It is an arithmetic number, because the mean of its divisors is an integer number (350304).

2^1357397 is an apocalyptic number.

It is an amenable number.

1357397 is a deficient number, since it is larger than the sum of its proper divisors (43819).

1357397 is an equidigital number, since it uses as much as digits as its factorization.

1357397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43818.

The product of its digits is 19845, while the sum is 35.

The square root of 1357397 is about 1165.0738174039. The cubic root of 1357397 is about 110.7224350376.

The spelling of 1357397 in words is "one million, three hundred fifty-seven thousand, three hundred ninety-seven".