1397659 has 4 divisors (see below), whose sum is σ = 1471240. Its totient is φ = 1324080.

The previous prime is 1397657. The next prime is 1397681. The reversal of 1397659 is 9567931.

1397659 = T₂₅₂ + T₂₅₃ + ... + T₂₈₉.

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

It is a cyclic number.

It is not a de Polignac number, because 1397659 - 2¹ = 1397657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397657) 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, 36762 + ... + 36799.

It is an arithmetic number, because the mean of its divisors is an integer number (367810).

2^1397659 is an apocalyptic number.

1397659 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1397659 is a deficient number, since it is larger than the sum of its proper divisors (73581).

1397659 is an equidigital number, since it uses as much as digits as its factorization.

1397659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73580.

The product of its digits is 51030, while the sum is 40.

The square root of 1397659 is about 1182.2262896755. The cubic root of 1397659 is about 111.8065058303.

It can be divided in two parts, 139 and 7659, that multiplied together give a palindrome (1064601).

The spelling of 1397659 in words is "one million, three hundred ninety-seven thousand, six hundred fifty-nine".