2150778 has 32 divisors (see below), whose sum is σ = 5040000. Its totient is φ = 599040.

The previous prime is 2150777. The next prime is 2150783. The reversal of 2150778 is 8770512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2150777) 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, 1098 + ... + 2346.

It is an arithmetic number, because the mean of its divisors is an integer number (157500).

2^2150778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2150778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2520000).

2150778 is an abundant number, since it is smaller than the sum of its proper divisors (2889222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2150778 is a wasteful number, since it uses less digits than its factorization.

2150778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 2150778 is about 1466.5531016639. The cubic root of 2150778 is about 129.0818541856.

The spelling of 2150778 in words is "two million, one hundred fifty thousand, seven hundred seventy-eight".