1887390666 has 32 divisors (see below), whose sum is σ = 4793374080. Its totient is φ = 539254368.

The previous prime is 1887390641. The next prime is 1887390671. The reversal of 1887390666 is 6660937881.

It is a happy number.

It is a super-2 number, since 2×1887390666² = 7124487052207847112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2496171 + ... + 2496926.

It is an arithmetic number, because the mean of its divisors is an integer number (149792940).

Almost surely, 2^1887390666 is an apocalyptic number.

1887390666 is an abundant number, since it is smaller than the sum of its proper divisors (2905983414).

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

1887390666 is a wasteful number, since it uses less digits than its factorization.

1887390666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993115 (or 4993109 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 1887390666 is about 43444.1096812905. The cubic root of 1887390666 is about 1235.8163432463.

The spelling of 1887390666 in words is "one billion, eight hundred eighty-seven million, three hundred ninety thousand, six hundred sixty-six".