999997903 has 8 divisors (see below), whose sum is σ = 1018108800. Its totient is φ = 981925848.

The previous prime is 999997891. The next prime is 999997967. The reversal of 999997903 is 309799999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999997903 - 2⁵ = 999997871 is a prime.

It is a super-3 number, since 3×999997903³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999997403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45000 + ... + 63442.

It is an arithmetic number, because the mean of its divisors is an integer number (127263600).

Almost surely, 2^999997903 is an apocalyptic number.

999997903 is a deficient number, since it is larger than the sum of its proper divisors (18110897).

999997903 is a wasteful number, since it uses less digits than its factorization.

999997903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19421.

The product of its (nonzero) digits is 11160261, while the sum is 64.

The square root of 999997903 is about 31622.7434451851. The cubic root of 999997903 is about 999.9993009995. Note that the first 3 decimals are identical.

It can be divided in two parts, 99999 and 7903, that multiplied together give a palindrome (790292097).

The spelling of 999997903 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, nine hundred three".