1988428 has 12 divisors (see below), whose sum is σ = 3747520. Its totient is φ = 917712.

The previous prime is 1988423. The next prime is 1988453. The reversal of 1988428 is 8248891.

It is a super-2 number, since 2×1988428² = 7907691822368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1988423) 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, 19068 + ... + 19171.

2^1988428 is an apocalyptic number.

It is an amenable number.

1988428 is a deficient number, since it is larger than the sum of its proper divisors (1759092).

1988428 is a wasteful number, since it uses less digits than its factorization.

1988428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38256 (or 38254 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 1988428 is about 1410.1163072598. The cubic root of 1988428 is about 125.7486380442.

The spelling of 1988428 in words is "one million, nine hundred eighty-eight thousand, four hundred twenty-eight".