1399490 has 16 divisors (see below), whose sum is σ = 2532600. Its totient is φ = 556800.

The previous prime is 1399477. The next prime is 1399493. The reversal of 1399490 is 949931.

It is a Cunningham number, because it is equal to 1183²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1399489 + 1 = 1183^2 + 1^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1399490.

It is not an unprimeable number, because it can be changed into a prime (1399493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3290 + ... + 3690.

2^1399490 is an apocalyptic number.

1399490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1399490 is a deficient number, since it is larger than the sum of its proper divisors (1133110).

1399490 is a wasteful number, since it uses less digits than its factorization.

1399490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1399490 is about 1183.0004226542. Note that the first 3 decimals coincide. The cubic root of 1399490 is about 111.8553084783.

The spelling of 1399490 in words is "one million, three hundred ninety-nine thousand, four hundred ninety".