38311220 has 48 divisors (see below), whose sum is σ = 86788800. Its totient is φ = 14158080.

The previous prime is 38311213. The next prime is 38311241. The reversal of 38311220 is 2211383.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 38311192 and 38311201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14351 + ... + 16809.

It is an arithmetic number, because the mean of its divisors is an integer number (1808100).

Almost surely, 2^38311220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38311220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43394400).

38311220 is an abundant number, since it is smaller than the sum of its proper divisors (48477580).

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

38311220 is a wasteful number, since it uses less digits than its factorization.

38311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 38311220 is about 6189.6058032802. The cubic root of 38311220 is about 337.1128656581.

The spelling of 38311220 in words is "thirty-eight million, three hundred eleven thousand, two hundred twenty".