1381821398 has 8 divisors (see below), whose sum is σ = 2181823320. Its totient is φ = 654546960.

The previous prime is 1381821391. The next prime is 1381821403. The reversal of 1381821398 is 8931281831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381821391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18181823 + ... + 18181898.

It is an arithmetic number, because the mean of its divisors is an integer number (272727915).

Almost surely, 2^1381821398 is an apocalyptic number.

1381821398 is a deficient number, since it is larger than the sum of its proper divisors (800001922).

1381821398 is a wasteful number, since it uses less digits than its factorization.

1381821398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36363742.

The product of its digits is 82944, while the sum is 44.

The square root of 1381821398 is about 37172.8583512218. The cubic root of 1381821398 is about 1113.8258798264.

The spelling of 1381821398 in words is "one billion, three hundred eighty-one million, eight hundred twenty-one thousand, three hundred ninety-eight".