1678992 has 80 divisors (see below), whose sum is σ = 5237760. Its totient is φ = 452736.

The previous prime is 1678979. The next prime is 1678993. The reversal of 1678992 is 2998761.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1678993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6253 + ... + 6515.

It is an arithmetic number, because the mean of its divisors is an integer number (65472).

2^1678992 is an apocalyptic number.

1678992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1678992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2618880).

1678992 is an abundant number, since it is smaller than the sum of its proper divisors (3558768).

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

1678992 is a wasteful number, since it uses less digits than its factorization.

1678992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 1678992 is about 1295.7592368955. The cubic root of 1678992 is about 118.8546586107.

The spelling of 1678992 in words is "one million, six hundred seventy-eight thousand, nine hundred ninety-two".