381640025 has 36 divisors (see below), whose sum is σ = 521462160. Its totient is φ = 276868800.

The previous prime is 381640019. The next prime is 381640033. The reversal of 381640025 is 520046183.

381640025 = T₅₅₁₃ + T₅₅₁₄ + ... + T₅₅₃₇.

It is not a de Polignac number, because 381640025 - 2⁴ = 381640009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381640025.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 248510 + ... + 250040.

It is an arithmetic number, because the mean of its divisors is an integer number (14485060).

Almost surely, 2^381640025 is an apocalyptic number.

It is an amenable number.

381640025 is a deficient number, since it is larger than the sum of its proper divisors (139822135).

381640025 is a wasteful number, since it uses less digits than its factorization.

381640025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 381640025 is about 19535.6091535432. The cubic root of 381640025 is about 725.3561626965.

The spelling of 381640025 in words is "three hundred eighty-one million, six hundred forty thousand, twenty-five".