31421403 has 24 divisors (see below), whose sum is σ = 49380240. Its totient is φ = 19137600.

The previous prime is 31421387. The next prime is 31421417. The reversal of 31421403 is 30412413.

It is not a de Polignac number, because 31421403 - 2⁴ = 31421387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31422403) 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 23 ways as a sum of consecutive naturals, for example, 10488 + ... + 13146.

It is an arithmetic number, because the mean of its divisors is an integer number (2057510).

Almost surely, 2^31421403 is an apocalyptic number.

31421403 is a deficient number, since it is larger than the sum of its proper divisors (17958837).

31421403 is a wasteful number, since it uses less digits than its factorization.

31421403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779 (or 2776 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31421403 is about 5605.4797296931. The cubic root of 31421403 is about 315.5550907873. Note that the first 3 decimals are identical.

Adding to 31421403 its reverse (30412413), we get a palindrome (61833816).

The spelling of 31421403 in words is "thirty-one million, four hundred twenty-one thousand, four hundred three".