381312393 has 16 divisors (see below), whose sum is σ = 633870336. Its totient is φ = 198084240.

The previous prime is 381312389. The next prime is 381312413. The reversal of 381312393 is 393213183.

It is not a de Polignac number, because 381312393 - 2² = 381312389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (381312313) 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, 825121 + ... + 825582.

It is an arithmetic number, because the mean of its divisors is an integer number (39616896).

Almost surely, 2^381312393 is an apocalyptic number.

381312393 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

381312393 is a deficient number, since it is larger than the sum of its proper divisors (252557943).

381312393 is a wasteful number, since it uses less digits than its factorization.

381312393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650724.

The product of its digits is 11664, while the sum is 33.

The square root of 381312393 is about 19527.2218454136. The cubic root of 381312393 is about 725.1485342915.

The spelling of 381312393 in words is "three hundred eighty-one million, three hundred twelve thousand, three hundred ninety-three".