997428903 has 16 divisors (see below), whose sum is σ = 1362193536. Its totient is φ = 648839520.

The previous prime is 997428893. The next prime is 997428941. The reversal of 997428903 is 309824799.

It is not a de Polignac number, because 997428903 - 2¹⁷ = 997297831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997428953) 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 15 ways as a sum of consecutive naturals, for example, 149076 + ... + 155622.

It is an arithmetic number, because the mean of its divisors is an integer number (85137096).

Almost surely, 2^997428903 is an apocalyptic number.

997428903 is a deficient number, since it is larger than the sum of its proper divisors (364764633).

997428903 is a wasteful number, since it uses less digits than its factorization.

997428903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7774.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 997428903 is about 31582.0978245588. The cubic root of 997428903 is about 999.1422321113.

The spelling of 997428903 in words is "nine hundred ninety-seven million, four hundred twenty-eight thousand, nine hundred three".