31381074 has 48 divisors (see below), whose sum is σ = 72327840. Its totient is φ = 10085040.

The previous prime is 31381073. The next prime is 31381079. The reversal of 31381074 is 47018313.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31381073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45069 + ... + 45759.

It is an arithmetic number, because the mean of its divisors is an integer number (1506830).

Almost surely, 2^31381074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31381074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36163920).

31381074 is an abundant number, since it is smaller than the sum of its proper divisors (40946766).

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

31381074 is a wasteful number, since it uses less digits than its factorization.

31381074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 31381074 is about 5601.8812911378. The cubic root of 31381074 is about 315.4200292422.

Adding to 31381074 its reverse (47018313), we get a palindrome (78399387).

The spelling of 31381074 in words is "thirty-one million, three hundred eighty-one thousand, seventy-four".