1978330 has 16 divisors (see below), whose sum is σ = 3583944. Its totient is φ = 786240.

The previous prime is 1978313. The next prime is 1978343. The reversal of 1978330 is 338791.

It can be written as a sum of positive squares in 4 ways, for example, as 1570009 + 408321 = 1253^2 + 639^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1978292 and 1978301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1264 + ... + 2356.

2^1978330 is an apocalyptic number.

1978330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1978330 is a deficient number, since it is larger than the sum of its proper divisors (1605614).

1978330 is a wasteful number, since it uses less digits than its factorization.

1978330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1978330 is about 1406.5311941084. The cubic root of 1978330 is about 125.5354100807.

The spelling of 1978330 in words is "one million, nine hundred seventy-eight thousand, three hundred thirty".