1978403 has 8 divisors (see below), whose sum is σ = 2272608. Its totient is φ = 1687104.

The previous prime is 1978393. The next prime is 1978411. The reversal of 1978403 is 3048791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978403 is a prime.

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 1978403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025 + ... + 2237.

It is an arithmetic number, because the mean of its divisors is an integer number (284076).

2^1978403 is an apocalyptic number.

1978403 is a deficient number, since it is larger than the sum of its proper divisors (294205).

1978403 is a wasteful number, since it uses less digits than its factorization.

1978403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1978403 is about 1406.5571442355. The cubic root of 1978403 is about 125.5369541393.

The spelling of 1978403 in words is "one million, nine hundred seventy-eight thousand, four hundred three".