1986214905 has 32 divisors (see below), whose sum is σ = 3533051520. Its totient is φ = 1058713920.

The previous prime is 1986214889. The next prime is 1986214949. The reversal of 1986214905 is 5094126891.

1986214905 is a `hidden beast` number, since 19 + 8 + 621 + 4 + 9 + 0 + 5 = 666.

It is not a de Polignac number, because 1986214905 - 2⁴ = 1986214889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 338779 + ... + 344591.

It is an arithmetic number, because the mean of its divisors is an integer number (110407860).

Almost surely, 2^1986214905 is an apocalyptic number.

1986214905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1986214905 is a deficient number, since it is larger than the sum of its proper divisors (1546836615).

1986214905 is a wasteful number, since it uses less digits than its factorization.

1986214905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8358 (or 8352 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1986214905 is about 44566.9710099307. The cubic root of 1986214905 is about 1257.0196851572.

The spelling of 1986214905 in words is "one billion, nine hundred eighty-six million, two hundred fourteen thousand, nine hundred five".