2156078 has 8 divisors (see below), whose sum is σ = 3303072. Its totient is φ = 1055056.

The previous prime is 2156071. The next prime is 2156083. The reversal of 2156078 is 8706512.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156071) 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, 11375 + ... + 11562.

It is an arithmetic number, because the mean of its divisors is an integer number (412884).

2^2156078 is an apocalyptic number.

2156078 is a deficient number, since it is larger than the sum of its proper divisors (1146994).

2156078 is a wasteful number, since it uses less digits than its factorization.

2156078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22986.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 2156078 is about 1468.3589479415. The cubic root of 2156078 is about 129.1877961040.

The spelling of 2156078 in words is "two million, one hundred fifty-six thousand, seventy-eight".