1438921 has 4 divisors (see below), whose sum is σ = 1569744. Its totient is φ = 1308100.

The previous prime is 1438919. The next prime is 1438933. The reversal of 1438921 is 1298341.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1438921 - 2¹ = 1438919 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1438921.

It is not an unprimeable number, because it can be changed into a prime (1438901) 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, 65395 + ... + 65416.

It is an arithmetic number, because the mean of its divisors is an integer number (392436).

2^1438921 is an apocalyptic number.

1438921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1438921 is a deficient number, since it is larger than the sum of its proper divisors (130823).

1438921 is a wasteful number, since it uses less digits than its factorization.

1438921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130822.

The product of its digits is 1728, while the sum is 28.

The square root of 1438921 is about 1199.5503324163. The cubic root of 1438921 is about 112.8961114771.

The spelling of 1438921 in words is "one million, four hundred thirty-eight thousand, nine hundred twenty-one".