2187405928 has 8 divisors (see below), whose sum is σ = 4101386130. Its totient is φ = 1093702960.

The previous prime is 2187405919. The next prime is 2187405937. The reversal of 2187405928 is 8295047812.

It is an interprime number because it is at equal distance from previous prime (2187405919) and next prime (2187405937).

It can be written as a sum of positive squares in only one way, i.e., 2184440644 + 2965284 = 46738^2 + 1722^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136712863 + ... + 136712878.

Almost surely, 2^2187405928 is an apocalyptic number.

It is an amenable number.

2187405928 is a deficient number, since it is larger than the sum of its proper divisors (1913980202).

2187405928 is a wasteful number, since it uses less digits than its factorization.

2187405928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273425747 (or 273425743 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 2187405928 is about 46769.7116518800. The cubic root of 2187405928 is about 1298.1049168796.

The spelling of 2187405928 in words is "two billion, one hundred eighty-seven million, four hundred five thousand, nine hundred twenty-eight".