1355903999 has 4 divisors (see below), whose sum is σ = 1357284336. Its totient is φ = 1354523664.

The previous prime is 1355903977. The next prime is 1355904007. The reversal of 1355903999 is 9993095531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1355903999 - 2¹² = 1355899903 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 1355903999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355906999) 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, 688694 + ... + 690659.

It is an arithmetic number, because the mean of its divisors is an integer number (339321084).

Almost surely, 2^1355903999 is an apocalyptic number.

1355903999 is a deficient number, since it is larger than the sum of its proper divisors (1380337).

1355903999 is an equidigital number, since it uses as much as digits as its factorization.

1355903999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380336.

The product of its (nonzero) digits is 1476225, while the sum is 53.

The square root of 1355903999 is about 36822.6017413219. The cubic root of 1355903999 is about 1106.8182560870.

The spelling of 1355903999 in words is "one billion, three hundred fifty-five million, nine hundred three thousand, nine hundred ninety-nine".