1679640 has 32 divisors (see below), whose sum is σ = 5039280. Its totient is φ = 447872.

The previous prime is 1679633. The next prime is 1679641. The reversal of 1679640 is 469761.

1679640 = T₁₇₉ + T₁₈₀ + ... + T₂₅₀.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1679641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6879 + ... + 7118.

2^1679640 is an apocalyptic number.

1679640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1679640 is an abundant number, since it is smaller than the sum of its proper divisors (3359640).

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

1679640 is a wasteful number, since it uses less digits than its factorization.

1679640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14011 (or 14007 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 1679640 is about 1296.0092592262. The cubic root of 1679640 is about 118.8699471316.

It can be divided in two parts, 16796 and 40, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 1679640 in words is "one million, six hundred seventy-nine thousand, six hundred forty".