381660026 has 32 divisors (see below), whose sum is σ = 637977600. Its totient is φ = 169775280.

The previous prime is 381660017. The next prime is 381660029. The reversal of 381660026 is 620066183.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 381659974 and 381660001.

It is not an unprimeable number, because it can be changed into a prime (381660029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366815 + ... + 367853.

It is an arithmetic number, because the mean of its divisors is an integer number (19936800).

Almost surely, 2^381660026 is an apocalyptic number.

381660026 is a deficient number, since it is larger than the sum of its proper divisors (256317574).

381660026 is a wasteful number, since it uses less digits than its factorization.

381660026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 381660026 is about 19536.1210581835. The cubic root of 381660026 is about 725.3688339698.

The spelling of 381660026 in words is "three hundred eighty-one million, six hundred sixty thousand, twenty-six".