1986263040 has 384 divisors, whose sum is σ = 6934636800. Its totient is φ = 483655680.

The previous prime is 1986263023. The next prime is 1986263057. The reversal of 1986263040 is 403626891.

It is an interprime number because it is at equal distance from previous prime (1986263023) and next prime (1986263057).

It is a tau number, because it is divible by the number of its divisors (384).

It is a self number, because there is not a number n which added to its sum of digits gives 1986263040.

It is a congruent number.

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, 23930839 + ... + 23930921.

It is an arithmetic number, because the mean of its divisors is an integer number (18058950).

Almost surely, 2^1986263040 is an apocalyptic number.

1986263040 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 1986263040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3467318400).

1986263040 is an abundant number, since it is smaller than the sum of its proper divisors (4948373760).

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

1986263040 is a wasteful number, since it uses less digits than its factorization.

1986263040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 1986263040 is about 44567.5110366285. The cubic root of 1986263040 is about 1257.0298395055.

The spelling of 1986263040 in words is "one billion, nine hundred eighty-six million, two hundred sixty-three thousand, forty".