1978653 has 8 divisors (see below), whose sum is σ = 2694528. Its totient is φ = 1290944.

The previous prime is 1978631. The next prime is 1978661. The reversal of 1978653 is 3568791.

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

It is a cyclic number.

It is not a de Polignac number, because 1978653 - 2⁶ = 1978589 is a prime.

1978653 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978663) 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 7 ways as a sum of consecutive naturals, for example, 6876 + ... + 7157.

It is an arithmetic number, because the mean of its divisors is an integer number (336816).

2^1978653 is an apocalyptic number.

It is an amenable number.

1978653 is a deficient number, since it is larger than the sum of its proper divisors (715875).

1978653 is a wasteful number, since it uses less digits than its factorization.

1978653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14083.

The product of its digits is 45360, while the sum is 39.

The square root of 1978653 is about 1406.6460109068. The cubic root of 1978653 is about 125.5422417234.

The spelling of 1978653 in words is "one million, nine hundred seventy-eight thousand, six hundred fifty-three".