31428903 has 32 divisors (see below), whose sum is σ = 48909312. Its totient is φ = 17888640.

The previous prime is 31428893. The next prime is 31428923. The reversal of 31428903 is 30982413.

It is not a de Polignac number, because 31428903 - 2¹² = 31424807 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31428923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67650 + ... + 68112.

It is an arithmetic number, because the mean of its divisors is an integer number (1528416).

Almost surely, 2^31428903 is an apocalyptic number.

31428903 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31428903 is a deficient number, since it is larger than the sum of its proper divisors (17480409).

31428903 is a wasteful number, since it uses less digits than its factorization.

31428903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 31428903 is about 5606.1486780142. The cubic root of 31428903 is about 315.5801954896.

The spelling of 31428903 in words is "thirty-one million, four hundred twenty-eight thousand, nine hundred three".