1381898466 has 72 divisors (see below), whose sum is σ = 3383280576. Its totient is φ = 406692000.

The previous prime is 1381898449. The next prime is 1381898537. The reversal of 1381898466 is 6648981831.

1381898466 is a `hidden beast` number, since 13 + 81 + 8 + 98 + 466 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60091 + ... + 79841.

It is an arithmetic number, because the mean of its divisors is an integer number (46990008).

Almost surely, 2^1381898466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381898466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1691640288).

1381898466 is an abundant number, since it is smaller than the sum of its proper divisors (2001382110).

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

1381898466 is a wasteful number, since it uses less digits than its factorization.

1381898466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19808 (or 19792 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 1381898466 is about 37173.8949533137. The cubic root of 1381898466 is about 1113.8465864911.

The spelling of 1381898466 in words is "one billion, three hundred eighty-one million, eight hundred ninety-eight thousand, four hundred sixty-six".