1321420749 has 16 divisors (see below), whose sum is σ = 1923471360. Its totient is φ = 800275760.

The previous prime is 1321420739. The next prime is 1321420753. The reversal of 1321420749 is 9470241231.

It is a cyclic number.

It is not a de Polignac number, because 1321420749 - 2⁵ = 1321420717 is a prime.

It is a super-3 number, since 3×1321420749³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321420739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33574 + ... + 61400.

It is an arithmetic number, because the mean of its divisors is an integer number (120216960).

Almost surely, 2^1321420749 is an apocalyptic number.

It is an amenable number.

1321420749 is a deficient number, since it is larger than the sum of its proper divisors (602050611).

1321420749 is a wasteful number, since it uses less digits than its factorization.

1321420749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29280.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1321420749 is about 36351.3514054155. The cubic root of 1321420749 is about 1097.3547316648.

The spelling of 1321420749 in words is "one billion, three hundred twenty-one million, four hundred twenty thousand, seven hundred forty-nine".