2721842 has 4 divisors (see below), whose sum is σ = 4082766. Its totient is φ = 1360920.

The previous prime is 2721841. The next prime is 2721863. The reversal of 2721842 is 2481272.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1739761 + 982081 = 1319^2 + 991^2 .

It is a d-powerful number, because it can be written as 2¹¹ + 7² + 2¹⁹ + 1 + 8⁵ + 4⁸ + 2²¹ .

It is not an unprimeable number, because it can be changed into a prime (2721841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680459 + ... + 680462.

2^2721842 is an apocalyptic number.

2721842 is a deficient number, since it is larger than the sum of its proper divisors (1360924).

2721842 is a wasteful number, since it uses less digits than its factorization.

2721842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360923.

The product of its digits is 1792, while the sum is 26.

The square root of 2721842 is about 1649.8005940113. The cubic root of 2721842 is about 139.6221443622.

The spelling of 2721842 in words is "two million, seven hundred twenty-one thousand, eight hundred forty-two".