2187442 has 8 divisors (see below), whose sum is σ = 3318300. Its totient is φ = 1081344.

The previous prime is 2187421. The next prime is 2187457. The reversal of 2187442 is 2447812.

It is a Cunningham number, because it is equal to 1479²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 2187441 + 1 = 1479^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁷ + 1 + 8⁷ + 7² + 4⁷ + 4⁸ + 2¹³ .

It is a self number, because there is not a number n which added to its sum of digits gives 2187442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5967 + ... + 6322.

2^2187442 is an apocalyptic number.

2187442 is a deficient number, since it is larger than the sum of its proper divisors (1130858).

2187442 is a wasteful number, since it uses less digits than its factorization.

2187442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12380.

The product of its digits is 3584, while the sum is 28.

The square root of 2187442 is about 1479.0003380662. Note that the first 3 decimals coincide. The cubic root of 2187442 is about 129.8112052422.

The spelling of 2187442 in words is "two million, one hundred eighty-seven thousand, four hundred forty-two".