1321404739 has 4 divisors (see below), whose sum is σ = 1333754424. Its totient is φ = 1309055056.

The previous prime is 1321404731. The next prime is 1321404767. The reversal of 1321404739 is 9374041231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9374041231 = 523 ⋅17923597.

It is a cyclic number.

It is not a de Polignac number, because 1321404739 - 2³ = 1321404731 is a prime.

It is a super-2 number, since 2×1321404739² = 3492220968503316242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321404731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6174682 + ... + 6174895.

It is an arithmetic number, because the mean of its divisors is an integer number (333438606).

Almost surely, 2^1321404739 is an apocalyptic number.

1321404739 is a deficient number, since it is larger than the sum of its proper divisors (12349685).

1321404739 is a wasteful number, since it uses less digits than its factorization.

1321404739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12349684.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 1321404739 is about 36351.1311928529. The cubic root of 1321404739 is about 1097.3502998893.

The spelling of 1321404739 in words is "one billion, three hundred twenty-one million, four hundred four thousand, seven hundred thirty-nine".