2151306 has 16 divisors (see below), whose sum is σ = 4780800. Its totient is φ = 717084.

The previous prime is 2151301. The next prime is 2151319. The reversal of 2151306 is 6031512.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2151301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19866 + ... + 19973.

It is an arithmetic number, because the mean of its divisors is an integer number (298800).

2^2151306 is an apocalyptic number.

2151306 is an abundant number, since it is smaller than the sum of its proper divisors (2629494).

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

2151306 is a wasteful number, since it uses less digits than its factorization.

2151306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39850 (or 39844 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 2151306 is about 1466.7331045558. The cubic root of 2151306 is about 129.0924161997.

Adding to 2151306 its reverse (6031512), we get a palindrome (8182818).

It can be divided in two parts, 215 and 1306, that added together give a square (1521 = 39²).

The spelling of 2151306 in words is "two million, one hundred fifty-one thousand, three hundred six".