1986455040 has 160 divisors (see below), whose sum is σ = 6441659136. Its totient is φ = 522117120.

The previous prime is 1986455039. The next prime is 1986455041. The reversal of 1986455040 is 405546891.

It is an interprime number because it is at equal distance from previous prime (1986455039) and next prime (1986455041).

It is a tau number, because it is divible by the number of its divisors (160).

It is a junction number, because it is equal to n+sod(n) for n = 1986454983 and 1986455001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986455041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543459 + ... + 547101.

Almost surely, 2^1986455040 is an apocalyptic number.

1986455040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1986455040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3220829568).

1986455040 is an abundant number, since it is smaller than the sum of its proper divisors (4455204096).

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

1986455040 is an equidigital number, since it uses as much as digits as its factorization.

1986455040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740 (or 3724 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 1986455040 is about 44569.6650200560. The cubic root of 1986455040 is about 1257.0703413504.

The spelling of 1986455040 in words is "one billion, nine hundred eighty-six million, four hundred fifty-five thousand, forty".