31419993 has 16 divisors (see below), whose sum is σ = 46938816. Its totient is φ = 18527040.

The previous prime is 31419979. The next prime is 31420009. The reversal of 31419993 is 39991413.

It is not a de Polignac number, because 31419993 - 2¹⁸ = 31157849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31419593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11646 + ... + 14087.

It is an arithmetic number, because the mean of its divisors is an integer number (2933676).

Almost surely, 2^31419993 is an apocalyptic number.

31419993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31419993 is a deficient number, since it is larger than the sum of its proper divisors (15518823).

31419993 is a wasteful number, since it uses less digits than its factorization.

31419993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25784.

The product of its digits is 26244, while the sum is 39.

The square root of 31419993 is about 5605.3539584936. The cubic root of 31419993 is about 315.5503706571.

It can be divided in two parts, 31 and 419993, that added together give a palindrome (420024).

The spelling of 31419993 in words is "thirty-one million, four hundred nineteen thousand, nine hundred ninety-three".