1393690 has 8 divisors (see below), whose sum is σ = 2508660. Its totient is φ = 557472.

The previous prime is 1393687. The next prime is 1393697. The reversal of 1393690 is 963931.

It can be written as a sum of positive squares in 2 ways, for example, as 1301881 + 91809 = 1141^2 + 303^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1393690² = 3884743632200, which contains 22 as substring.

It is an Ulam number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1393697) 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, 69675 + ... + 69694.

2^1393690 is an apocalyptic number.

1393690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1393690 is a deficient number, since it is larger than the sum of its proper divisors (1114970).

1393690 is a wasteful number, since it uses less digits than its factorization.

1393690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139376.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 1393690 is about 1180.5464836253. The cubic root of 1393690 is about 111.7005713734.

The spelling of 1393690 in words is "one million, three hundred ninety-three thousand, six hundred ninety".