1397405 has 4 divisors (see below), whose sum is σ = 1676892. Its totient is φ = 1117920.

The previous prime is 1397359. The next prime is 1397437. The reversal of 1397405 is 5047931.

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 840889 + 556516 = 917^2 + 746^2 .

It is not a de Polignac number, because 1397405 - 2¹⁸ = 1135261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 139736 + ... + 139745.

It is an arithmetic number, because the mean of its divisors is an integer number (419223).

2^1397405 is an apocalyptic number.

It is an amenable number.

1397405 is a deficient number, since it is larger than the sum of its proper divisors (279487).

1397405 is an equidigital number, since it uses as much as digits as its factorization.

1397405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279486.

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

The square root of 1397405 is about 1182.1188603520. The cubic root of 1397405 is about 111.7997324631.

The spelling of 1397405 in words is "one million, three hundred ninety-seven thousand, four hundred five".