1338021453 has 16 divisors (see below), whose sum is σ = 1814941760. Its totient is φ = 876645504.

The previous prime is 1338021449. The next prime is 1338021457. The reversal of 1338021453 is 3541208331.

It is an interprime number because it is at equal distance from previous prime (1338021449) and next prime (1338021457).

It is not a de Polignac number, because 1338021453 - 2² = 1338021449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1338021453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338021457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51183 + ... + 72771.

It is an arithmetic number, because the mean of its divisors is an integer number (113433860).

Almost surely, 2^1338021453 is an apocalyptic number.

It is an amenable number.

1338021453 is a deficient number, since it is larger than the sum of its proper divisors (476920307).

1338021453 is a wasteful number, since it uses less digits than its factorization.

1338021453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21948.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1338021453 is about 36578.9755597392. The cubic root of 1338021453 is about 1101.9308931821.

Adding to 1338021453 its reverse (3541208331), we get a palindrome (4879229784).

The spelling of 1338021453 in words is "one billion, three hundred thirty-eight million, twenty-one thousand, four hundred fifty-three".