1638150486 has 64 divisors (see below), whose sum is σ = 3816708096. Its totient is φ = 459043200.

The previous prime is 1638150461. The next prime is 1638150487. The reversal of 1638150486 is 6840518361.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638150487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1185516 + ... + 1186896.

It is an arithmetic number, because the mean of its divisors is an integer number (59636064).

Almost surely, 2^1638150486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1638150486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1908354048).

1638150486 is an abundant number, since it is smaller than the sum of its proper divisors (2178557610).

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

1638150486 is a wasteful number, since it uses less digits than its factorization.

1638150486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 1638150486 is about 40474.0717744089. The cubic root of 1638150486 is about 1178.8302316416.

The spelling of 1638150486 in words is "one billion, six hundred thirty-eight million, one hundred fifty thousand, four hundred eighty-six".