1978413 has 16 divisors (see below), whose sum is σ = 2827200. Its totient is φ = 1226880.

The previous prime is 1978411. The next prime is 1978421. The reversal of 1978413 is 3148791.

It is not a de Polignac number, because 1978413 - 2¹ = 1978411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3193 + ... + 3761.

It is an arithmetic number, because the mean of its divisors is an integer number (176700).

2^1978413 is an apocalyptic number.

It is an amenable number.

1978413 is a deficient number, since it is larger than the sum of its proper divisors (848787).

1978413 is a wasteful number, since it uses less digits than its factorization.

1978413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652.

The product of its digits is 6048, while the sum is 33.

The square root of 1978413 is about 1406.5606990102. The cubic root of 1978413 is about 125.5371656512.

The spelling of 1978413 in words is "one million, nine hundred seventy-eight thousand, four hundred thirteen".