381777405 has 32 divisors (see below), whose sum is σ = 619660800. Its totient is φ = 200696832.

The previous prime is 381777401. The next prime is 381777419. The reversal of 381777405 is 504777183.

It is a happy number.

It is not a de Polignac number, because 381777405 - 2² = 381777401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381777401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390277 + ... + 391253.

It is an arithmetic number, because the mean of its divisors is an integer number (19364400).

Almost surely, 2^381777405 is an apocalyptic number.

It is an amenable number.

381777405 is a deficient number, since it is larger than the sum of its proper divisors (237883395).

381777405 is a wasteful number, since it uses less digits than its factorization.

381777405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333.

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 381777405 is about 19539.1249804079. The cubic root of 381777405 is about 725.4431884000.

The spelling of 381777405 in words is "three hundred eighty-one million, seven hundred seventy-seven thousand, four hundred five".