387428 has 6 divisors (see below), whose sum is σ = 678006. Its totient is φ = 193712.

The previous prime is 387403. The next prime is 387433. The reversal of 387428 is 824783.

It can be written as a sum of positive squares in only one way, i.e., 252004 + 135424 = 502^2 + 368^2 .

It is a junction number, because it is equal to n+sod(n) for n = 387394 and 387403.

It is an unprimeable number.

387428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48425 + ... + 48432.

It is an arithmetic number, because the mean of its divisors is an integer number (113001).

2³⁸⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

387428 is a deficient number, since it is larger than the sum of its proper divisors (290578).

387428 is a wasteful number, since it uses less digits than its factorization.

387428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96861 (or 96859 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 387428 is about 622.4371454211. The cubic root of 387428 is about 72.9004711060.

The spelling of 387428 in words is "three hundred eighty-seven thousand, four hundred twenty-eight".