1778006 has 8 divisors (see below), whose sum is σ = 2732184. Its totient is φ = 867280.

The previous prime is 1778003. The next prime is 1778009. The reversal of 1778006 is 6008771.

It is an interprime number because it is at equal distance from previous prime (1778003) and next prime (1778009).

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

It is a super-2 number, since 2×1778006² = 6322610672072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1778006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1778003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10760 + ... + 10923.

It is an arithmetic number, because the mean of its divisors is an integer number (341523).

2^1778006 is an apocalyptic number.

1778006 is a deficient number, since it is larger than the sum of its proper divisors (954178).

1778006 is a wasteful number, since it uses less digits than its factorization.

1778006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21726.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 1778006 is about 1333.4189139202. The cubic root of 1778006 is about 121.1465564749.

The spelling of 1778006 in words is "one million, seven hundred seventy-eight thousand, six".