31390038 has 32 divisors (see below), whose sum is σ = 70408800. Its totient is φ = 10365408.

The previous prime is 31390027. The next prime is 31390067. The reversal of 31390038 is 83009313.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31389993 and 31390020.

It is a congruent number.

It is an unprimeable number.

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, 3220 + ... + 8552.

It is an arithmetic number, because the mean of its divisors is an integer number (2200275).

Almost surely, 2^31390038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31390038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35204400).

31390038 is an abundant number, since it is smaller than the sum of its proper divisors (39018762).

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

31390038 is a wasteful number, since it uses less digits than its factorization.

31390038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5453 (or 5447 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 31390038 is about 5602.6813223670. The cubic root of 31390038 is about 315.4500596141.

It can be divided in two parts, 3 and 1390038, that added together give a square (1390041 = 1179²).

The spelling of 31390038 in words is "thirty-one million, three hundred ninety thousand, thirty-eight".