1978829 has 4 divisors (see below), whose sum is σ = 1989276. Its totient is φ = 1968384.

The previous prime is 1978807. The next prime is 1978849. The reversal of 1978829 is 9288791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 348100 + 1630729 = 590^2 + 1277^2 .

It is a cyclic number.

It is not a de Polignac number, because 1978829 - 2¹⁶ = 1913293 is a prime.

It is a super-3 number, since 3×1978829³ = 23245883335097450367, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1978829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978849) 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, 4934 + ... + 5319.

It is an arithmetic number, because the mean of its divisors is an integer number (497319).

2^1978829 is an apocalyptic number.

It is an amenable number.

1978829 is a deficient number, since it is larger than the sum of its proper divisors (10447).

1978829 is a wasteful number, since it uses less digits than its factorization.

1978829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10446.

The product of its digits is 72576, while the sum is 44.

The square root of 1978829 is about 1406.7085696760. The cubic root of 1978829 is about 125.5459639155.

The spelling of 1978829 in words is "one million, nine hundred seventy-eight thousand, eight hundred twenty-nine".