1397561 has 4 divisors (see below), whose sum is σ = 1524624. Its totient is φ = 1270500.

The previous prime is 1397551. The next prime is 1397563. The reversal of 1397561 is 1657931.

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: 1657931 = 11 ⋅150721.

It is not a de Polignac number, because 1397561 - 2⁶ = 1397497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397563) 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, 63515 + ... + 63536.

It is an arithmetic number, because the mean of its divisors is an integer number (381156).

2^1397561 is an apocalyptic number.

1397561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1397561 is a deficient number, since it is larger than the sum of its proper divisors (127063).

1397561 is a wasteful number, since it uses less digits than its factorization.

1397561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127062.

The product of its digits is 5670, while the sum is 32.

The square root of 1397561 is about 1182.1848417232. The cubic root of 1397561 is about 111.8038925811.

The spelling of 1397561 in words is "one million, three hundred ninety-seven thousand, five hundred sixty-one".