1387928 has 8 divisors (see below), whose sum is σ = 2602380. Its totient is φ = 693960.

The previous prime is 1387927. The next prime is 1387943. The reversal of 1387928 is 8297831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1387891 and 1387900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86738 + ... + 86753.

2^1387928 is an apocalyptic number.

It is an amenable number.

1387928 is a deficient number, since it is larger than the sum of its proper divisors (1214452).

1387928 is a wasteful number, since it uses less digits than its factorization.

1387928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173497 (or 173493 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 1387928 is about 1178.1035608129. The cubic root of 1387928 is about 111.5464223837.

Subtracting 1387928 from its reverse (8297831), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1387928 in words is "one million, three hundred eighty-seven thousand, nine hundred twenty-eight".