381590138 has 4 divisors (see below), whose sum is σ = 572385210. Its totient is φ = 190795068.

The previous prime is 381590123. The next prime is 381590159. The reversal of 381590138 is 831095183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831095183 = 3449 ⋅240967.

It can be written as a sum of positive squares in only one way, i.e., 380523049 + 1067089 = 19507^2 + 1033^2 .

It is a super-2 number, since 2×381590138² = 291222066837718088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95397533 + ... + 95397536.

Almost surely, 2^381590138 is an apocalyptic number.

381590138 is a deficient number, since it is larger than the sum of its proper divisors (190795072).

381590138 is a wasteful number, since it uses less digits than its factorization.

381590138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190795071.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 381590138 is about 19534.3322895870. The cubic root of 381590138 is about 725.3245557568.

The spelling of 381590138 in words is "three hundred eighty-one million, five hundred ninety thousand, one hundred thirty-eight".