2120742 has 80 divisors (see below), whose sum is σ = 5488560. Its totient is φ = 606528.

The previous prime is 2120731. The next prime is 2120747. The reversal of 2120742 is 2470212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120747) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39988 + ... + 40040.

It is an arithmetic number, because the mean of its divisors is an integer number (68607).

2^2120742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2120742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2744280).

2120742 is an abundant number, since it is smaller than the sum of its proper divisors (3367818).

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

2120742 is a wasteful number, since it uses less digits than its factorization.

2120742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 2120742 is about 1456.2767594108. The cubic root of 2120742 is about 128.4781513924.

Adding to 2120742 its reverse (2470212), we get a palindrome (4590954).

The spelling of 2120742 in words is "two million, one hundred twenty thousand, seven hundred forty-two".