31300380 has 36 divisors (see below), whose sum is σ = 94945032. Its totient is φ = 8346720.

The previous prime is 31300327. The next prime is 31300397. The reversal of 31300380 is 8300313.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86766 + ... + 87125.

It is an arithmetic number, because the mean of its divisors is an integer number (2637362).

Almost surely, 2^31300380 is an apocalyptic number.

31300380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31300380 is an abundant number, since it is smaller than the sum of its proper divisors (63644652).

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

31300380 is a wasteful number, since it uses less digits than its factorization.

31300380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173906 (or 173901 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31300380 is about 5594.6742532519. The cubic root of 31300380 is about 315.1494377870.

Adding to 31300380 its reverse (8300313), we get a palindrome (39600693).

The spelling of 31300380 in words is "thirty-one million, three hundred thousand, three hundred eighty".