1331404399 has 16 divisors (see below), whose sum is σ = 1514512384. Its totient is φ = 1161669600.

The previous prime is 1331404387. The next prime is 1331404429. The reversal of 1331404399 is 9934041331.

It is not a de Polignac number, because 1331404399 - 2¹¹ = 1331402351 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 (1331404379) 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, 21087 + ... + 55744.

It is an arithmetic number, because the mean of its divisors is an integer number (94657024).

Almost surely, 2^1331404399 is an apocalyptic number.

1331404399 is a deficient number, since it is larger than the sum of its proper divisors (183107985).

1331404399 is a wasteful number, since it uses less digits than its factorization.

1331404399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76918.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 1331404399 is about 36488.4145860025. The cubic root of 1331404399 is about 1100.1113934024. Note that the first 3 decimals are identical.

The spelling of 1331404399 in words is "one billion, three hundred thirty-one million, four hundred four thousand, three hundred ninety-nine".