31420380 has 24 divisors (see below), whose sum is σ = 87977232. Its totient is φ = 8378752.

The previous prime is 31420379. The next prime is 31420381. The reversal of 31420380 is 8302413.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31420379) and next prime (31420381).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420381) 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 7 ways as a sum of consecutive naturals, for example, 261777 + ... + 261896.

It is an arithmetic number, because the mean of its divisors is an integer number (3665718).

Almost surely, 2^31420380 is an apocalyptic number.

31420380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31420380 is an abundant number, since it is smaller than the sum of its proper divisors (56556852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31420380 is a wasteful number, since it uses less digits than its factorization.

31420380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523685 (or 523683 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 31420380 is about 5605.3884789549. The cubic root of 31420380 is about 315.5516661963.

Adding to 31420380 its reverse (8302413), we get a palindrome (39722793).

The spelling of 31420380 in words is "thirty-one million, four hundred twenty thousand, three hundred eighty".