1978130 has 48 divisors (see below), whose sum is σ = 4530816. Its totient is φ = 614880.

The previous prime is 1978117. The next prime is 1978153. The reversal of 1978130 is 318791.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1978093 and 1978102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5207 + ... + 5573.

It is an arithmetic number, because the mean of its divisors is an integer number (94392).

2^1978130 is an apocalyptic number.

1978130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1978130 is an abundant number, since it is smaller than the sum of its proper divisors (2552686).

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

1978130 is a wasteful number, since it uses less digits than its factorization.

1978130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1978130 is about 1406.4600954169. The cubic root of 1978130 is about 125.5311795887.

The spelling of 1978130 in words is "one million, nine hundred seventy-eight thousand, one hundred thirty".