38391228 has 18 divisors (see below), whose sum is σ = 97044584. Its totient is φ = 12797064.

The previous prime is 38391187. The next prime is 38391233. The reversal of 38391228 is 82219383.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1066423 = 38391228 / (3 + 8 + 3 + 9 + 1 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 38391192 and 38391201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 533176 + ... + 533247.

Almost surely, 2^38391228 is an apocalyptic number.

It is an amenable number.

38391228 is an abundant number, since it is smaller than the sum of its proper divisors (58653356).

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

38391228 is a wasteful number, since it uses less digits than its factorization.

38391228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066433 (or 1066428 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 38391228 is about 6196.0655257994. The cubic root of 38391228 is about 337.3473746110.

The spelling of 38391228 in words is "thirty-eight million, three hundred ninety-one thousand, two hundred twenty-eight".