381239407 has 4 divisors (see below), whose sum is σ = 381381736. Its totient is φ = 381097080.

The previous prime is 381239401. The next prime is 381239413. The reversal of 381239407 is 704932183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704932183 = 17 ⋅41466599.

It is an interprime number because it is at equal distance from previous prime (381239401) and next prime (381239413).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381239407 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 (381239401) 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, 67068 + ... + 72529.

It is an arithmetic number, because the mean of its divisors is an integer number (95345434).

Almost surely, 2^381239407 is an apocalyptic number.

381239407 is a deficient number, since it is larger than the sum of its proper divisors (142329).

381239407 is a wasteful number, since it uses less digits than its factorization.

381239407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142328.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 381239407 is about 19525.3529289486. The cubic root of 381239407 is about 725.1022650828.

The spelling of 381239407 in words is "three hundred eighty-one million, two hundred thirty-nine thousand, four hundred seven".