381023999 has 4 divisors (see below), whose sum is σ = 381185880. Its totient is φ = 380862120.

The previous prime is 381023983. The next prime is 381024001. The reversal of 381023999 is 999320183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999320183 = 41 ⋅24373663.

It is a cyclic number.

It is not a de Polignac number, because 381023999 - 2⁴ = 381023983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381023969) 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, 77357 + ... + 82134.

It is an arithmetic number, because the mean of its divisors is an integer number (95296470).

Almost surely, 2^381023999 is an apocalyptic number.

381023999 is a deficient number, since it is larger than the sum of its proper divisors (161881).

381023999 is a wasteful number, since it uses less digits than its factorization.

381023999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161880.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 381023999 is about 19519.8360392704. The cubic root of 381023999 is about 724.9656735234.

The spelling of 381023999 in words is "three hundred eighty-one million, twenty-three thousand, nine hundred ninety-nine".