381657406 has 16 divisors (see below), whose sum is σ = 623955024. Its totient is φ = 174026304.

The previous prime is 381657403. The next prime is 381657407. The reversal of 381657406 is 604756183.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381657401) 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, 86271 + ... + 90586.

It is an arithmetic number, because the mean of its divisors is an integer number (38997189).

Almost surely, 2^381657406 is an apocalyptic number.

381657406 is a deficient number, since it is larger than the sum of its proper divisors (242297618).

381657406 is a wasteful number, since it uses less digits than its factorization.

381657406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176955.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 381657406 is about 19536.0540027919. The cubic root of 381657406 is about 725.3671741412.

The spelling of 381657406 in words is "three hundred eighty-one million, six hundred fifty-seven thousand, four hundred six".