1390849 has 4 divisors (see below), whose sum is σ = 1393236. Its totient is φ = 1388464.

The previous prime is 1390847. The next prime is 1390859. The reversal of 1390849 is 9480931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9480931 = 127 ⋅74653.

It can be written as a sum of positive squares in 2 ways, for example, as 651249 + 739600 = 807^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390849 - 2¹ = 1390847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390841) 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, 327 + ... + 1699.

It is an arithmetic number, because the mean of its divisors is an integer number (348309).

2^1390849 is an apocalyptic number.

It is an amenable number.

1390849 is a deficient number, since it is larger than the sum of its proper divisors (2387).

1390849 is a wasteful number, since it uses less digits than its factorization.

1390849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1390849 is about 1179.3426134928. The cubic root of 1390849 is about 111.6246201939.

The spelling of 1390849 in words is "one million, three hundred ninety thousand, eight hundred forty-nine".