1986342745 has 16 divisors (see below), whose sum is σ = 2556411840. Its totient is φ = 1477030464.

The previous prime is 1986342737. The next prime is 1986342751. The reversal of 1986342745 is 5472436891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1986342745 - 2³ = 1986342737 is a prime.

It is a super-2 number, since 2×1986342745² = 7891115001228270050, which contains 22 as substring.

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, 192219 + ... + 202288.

It is an arithmetic number, because the mean of its divisors is an integer number (159775740).

Almost surely, 2^1986342745 is an apocalyptic number.

It is an amenable number.

1986342745 is a deficient number, since it is larger than the sum of its proper divisors (570069095).

1986342745 is a wasteful number, since it uses less digits than its factorization.

1986342745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394584.

The product of its digits is 1451520, while the sum is 49.

The square root of 1986342745 is about 44568.4052328553. The cubic root of 1986342745 is about 1257.0466533616.

The spelling of 1986342745 in words is "one billion, nine hundred eighty-six million, three hundred forty-two thousand, seven hundred forty-five".