2139816 has 64 divisors (see below), whose sum is σ = 6266880. Its totient is φ = 596160.

The previous prime is 2139811. The next prime is 2139817. The reversal of 2139816 is 6189312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139811) 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, 7761 + ... + 8031.

It is an arithmetic number, because the mean of its divisors is an integer number (97920).

2^2139816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2139816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3133440).

2139816 is an abundant number, since it is smaller than the sum of its proper divisors (4127064).

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

2139816 is a wasteful number, since it uses less digits than its factorization.

2139816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 330 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 2139816 is about 1462.8109925756. The cubic root of 2139816 is about 128.8621807962.

The spelling of 2139816 in words is "two million, one hundred thirty-nine thousand, eight hundred sixteen".