1978353 has 24 divisors (see below), whose sum is σ = 3167528. Its totient is φ = 1181952.

The previous prime is 1978349. The next prime is 1978363. The reversal of 1978353 is 3538791.

It can be written as a sum of positive squares in 4 ways, for example, as 685584 + 1292769 = 828^2 + 1137^2 .

It is not a de Polignac number, because 1978353 - 2² = 1978349 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1978313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4101 + ... + 4557.

2^1978353 is an apocalyptic number.

1978353 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1978353 is a deficient number, since it is larger than the sum of its proper divisors (1189175).

1978353 is a wasteful number, since it uses less digits than its factorization.

1978353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 510 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 1978353 is about 1406.5393702275. The cubic root of 1978353 is about 125.5358965690.

It can be divided in two parts, 197835 and 3, that multiplied together give a triangular number (593505 = T₁₀₈₉).

The spelling of 1978353 in words is "one million, nine hundred seventy-eight thousand, three hundred fifty-three".