1299438421 has 4 divisors (see below), whose sum is σ = 1312054432. Its totient is φ = 1286822412.

The previous prime is 1299438407. The next prime is 1299438487. The reversal of 1299438421 is 1248349921.

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 1299438421 - 2⁵ = 1299438389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299436421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6307851 + ... + 6308056.

It is an arithmetic number, because the mean of its divisors is an integer number (328013608).

Almost surely, 2^1299438421 is an apocalyptic number.

It is an amenable number.

1299438421 is a deficient number, since it is larger than the sum of its proper divisors (12616011).

1299438421 is a wasteful number, since it uses less digits than its factorization.

1299438421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12616010.

The product of its digits is 124416, while the sum is 43.

The square root of 1299438421 is about 36047.7242138807. The cubic root of 1299438421 is about 1091.2357057278.

It can be divided in two parts, 12994 and 38421, that added together give a palindrome (51415).

The spelling of 1299438421 in words is "one billion, two hundred ninety-nine million, four hundred thirty-eight thousand, four hundred twenty-one".