1538428 has 12 divisors (see below), whose sum is σ = 2730672. Its totient is φ = 758240.

The previous prime is 1538419. The next prime is 1538429. The reversal of 1538428 is 8248351.

It is a super-2 number, since 2×1538428² = 4733521422368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1538428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2425 + ... + 2992.

It is an arithmetic number, because the mean of its divisors is an integer number (227556).

2^1538428 is an apocalyptic number.

It is an amenable number.

1538428 is a deficient number, since it is larger than the sum of its proper divisors (1192244).

1538428 is a wasteful number, since it uses less digits than its factorization.

1538428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5492 (or 5490 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 1538428 is about 1240.3338260323. Note that the first 3 decimals coincide. The cubic root of 1538428 is about 115.4407284449.

The spelling of 1538428 in words is "one million, five hundred thirty-eight thousand, four hundred twenty-eight".