1390045 has 8 divisors (see below), whose sum is σ = 1675224. Its totient is φ = 1107264.

The previous prime is 1390043. The next prime is 1390069. The reversal of 1390045 is 5400931.

It can be written as a sum of positive squares in 4 ways, for example, as 76729 + 1313316 = 277^2 + 1146^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1390045 - 2¹ = 1390043 is a prime.

It is a Duffinian number.

1390045 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1389998 and 1390025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1147 + ... + 2023.

It is an arithmetic number, because the mean of its divisors is an integer number (209403).

2^1390045 is an apocalyptic number.

It is an amenable number.

1390045 is a deficient number, since it is larger than the sum of its proper divisors (285179).

1390045 is an equidigital number, since it uses as much as digits as its factorization.

1390045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1390045 is about 1179.0016963516. The cubic root of 1390045 is about 111.6031073162.

Adding to 1390045 its reverse (5400931), we get a palindrome (6790976).

The spelling of 1390045 in words is "one million, three hundred ninety thousand, forty-five".