381705137 has 8 divisors (see below), whose sum is σ = 417322272. Its totient is φ = 346240800.

The previous prime is 381705133. The next prime is 381705143. The reversal of 381705137 is 731507183.

381705137 = T₄₁₈ + T₄₁₉ + ... + T₁₃₃₁.

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

It is a cyclic number.

It is not a de Polignac number, because 381705137 - 2² = 381705133 is a prime.

It is a super-2 number, since 2×381705137² = 291397623224377538, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381705097 and 381705106.

It is not an unprimeable number, because it can be changed into a prime (381705133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32939 + ... + 42992.

It is an arithmetic number, because the mean of its divisors is an integer number (52165284).

Almost surely, 2^381705137 is an apocalyptic number.

It is an amenable number.

381705137 is a deficient number, since it is larger than the sum of its proper divisors (35617135).

381705137 is a wasteful number, since it uses less digits than its factorization.

381705137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76399.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 381705137 is about 19537.2755777258. The cubic root of 381705137 is about 725.3974116062.

The spelling of 381705137 in words is "three hundred eighty-one million, seven hundred five thousand, one hundred thirty-seven".