1438600921 has 4 divisors (see below), whose sum is σ = 1440027700. Its totient is φ = 1437174144.

The previous prime is 1438600879. The next prime is 1438600927. The reversal of 1438600921 is 1290068341.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 605701321 + 832899600 = 24611^2 + 28860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438600921 - 2¹⁷ = 1438469849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1438600927) 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, 711876 + ... + 713893.

It is an arithmetic number, because the mean of its divisors is an integer number (360006925).

Almost surely, 2^1438600921 is an apocalyptic number.

It is an amenable number.

1438600921 is a deficient number, since it is larger than the sum of its proper divisors (1426779).

1438600921 is a wasteful number, since it uses less digits than its factorization.

1438600921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426778.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1438600921 is about 37928.8929577440. The cubic root of 1438600921 is about 1128.8773984443.

The spelling of 1438600921 in words is "one billion, four hundred thirty-eight million, six hundred thousand, nine hundred twenty-one".