1978850 has 24 divisors (see below), whose sum is σ = 3876240. Its totient is φ = 749520.

The previous prime is 1978849. The next prime is 1978853. The reversal of 1978850 is 588791.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (1978853) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 92 + ... + 1991.

It is an arithmetic number, because the mean of its divisors is an integer number (161510).

2^1978850 is an apocalyptic number.

1978850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1978850 is a deficient number, since it is larger than the sum of its proper divisors (1897390).

1978850 is a wasteful number, since it uses less digits than its factorization.

1978850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114 (or 2109 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1978850 is about 1406.7160338889. The cubic root of 1978850 is about 125.5464080259.

The spelling of 1978850 in words is "one million, nine hundred seventy-eight thousand, eight hundred fifty".