1393689 has 16 divisors (see below), whose sum is σ = 2047680. Its totient is φ = 836160.

The previous prime is 1393687. The next prime is 1393697. The reversal of 1393689 is 9863931.

It is not a de Polignac number, because 1393689 - 2¹ = 1393687 is a prime.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1393681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5047 + ... + 5315.

It is an arithmetic number, because the mean of its divisors is an integer number (127980).

2^1393689 is an apocalyptic number.

It is an amenable number.

1393689 is a deficient number, since it is larger than the sum of its proper divisors (653991).

1393689 is a wasteful number, since it uses less digits than its factorization.

1393689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its digits is 34992, while the sum is 39.

The square root of 1393689 is about 1180.5460600925. The cubic root of 1393689 is about 111.7005446576.

It can be divided in two parts, 139 and 3689, that added together give a triangular number (3828 = T₈₇).

The spelling of 1393689 in words is "one million, three hundred ninety-three thousand, six hundred eighty-nine".