1438649 has 4 divisors (see below), whose sum is σ = 1473780. Its totient is φ = 1403520.

The previous prime is 1438643. The next prime is 1438663. The reversal of 1438649 is 9468341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9468341 = 23 ⋅411667.

It can be written as a sum of positive squares in 2 ways, for example, as 570025 + 868624 = 755^2 + 932^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438649 - 2¹² = 1434553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1438643) 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, 17504 + ... + 17585.

It is an arithmetic number, because the mean of its divisors is an integer number (368445).

2^1438649 is an apocalyptic number.

It is an amenable number.

1438649 is a deficient number, since it is larger than the sum of its proper divisors (35131).

1438649 is an equidigital number, since it uses as much as digits as its factorization.

1438649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35130.

The product of its digits is 20736, while the sum is 35.

The square root of 1438649 is about 1199.4369512400. The cubic root of 1438649 is about 112.8889974249. Note that the first 3 decimals are identical.

The spelling of 1438649 in words is "one million, four hundred thirty-eight thousand, six hundred forty-nine".