2188387090 has 8 divisors (see below), whose sum is σ = 3939096780. Its totient is φ = 875354832.

The previous prime is 2188387081. The next prime is 2188387093. The reversal of 2188387090 is 907838812.

It can be written as a sum of positive squares in 2 ways, for example, as 2003726169 + 184660921 = 44763^2 + 13589^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 2188387090.

It is not an unprimeable number, because it can be changed into a prime (2188387093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109419345 + ... + 109419364.

Almost surely, 2^2188387090 is an apocalyptic number.

2188387090 is a deficient number, since it is larger than the sum of its proper divisors (1750709690).

2188387090 is a wasteful number, since it uses less digits than its factorization.

2188387090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218838716.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 2188387090 is about 46780.1997644302. The cubic root of 2188387090 is about 1298.2989763994.

The spelling of 2188387090 in words is "two billion, one hundred eighty-eight million, three hundred eighty-seven thousand, ninety".