1978141 has 8 divisors (see below), whose sum is σ = 2227968. Its totient is φ = 1740000.

The previous prime is 1978117. The next prime is 1978153. The reversal of 1978141 is 1418791.

1978141 = T₁₅₈ + T₁₅₉ + ... + T₂₅₀.

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 1978141 - 2¹³ = 1969949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560 + ... + 3241.

It is an arithmetic number, because the mean of its divisors is an integer number (278496).

2^1978141 is an apocalyptic number.

1978141 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1978141 is a deficient number, since it is larger than the sum of its proper divisors (249827).

1978141 is a wasteful number, since it uses less digits than its factorization.

1978141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843.

The product of its digits is 2016, while the sum is 31.

The square root of 1978141 is about 1406.4640059383. The cubic root of 1978141 is about 125.5314122731.

It can be divided in two parts, 197 and 8141, that added together give a palindrome (8338).

The spelling of 1978141 in words is "one million, nine hundred seventy-eight thousand, one hundred forty-one".