381554778 has 16 divisors (see below), whose sum is σ = 832483296. Its totient is φ = 115622640.

The previous prime is 381554773. The next prime is 381554809. The reversal of 381554778 is 877455183.

It is a happy number.

It is a super-2 number, since 2×381554778² = 291168097229258568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381554773) 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, 2890501 + ... + 2890632.

It is an arithmetic number, because the mean of its divisors is an integer number (52030206).

Almost surely, 2^381554778 is an apocalyptic number.

381554778 is an abundant number, since it is smaller than the sum of its proper divisors (450928518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381554778 is a wasteful number, since it uses less digits than its factorization.

381554778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5781149.

The product of its digits is 940800, while the sum is 48.

The square root of 381554778 is about 19533.4271954514. The cubic root of 381554778 is about 725.3021510299.

The spelling of 381554778 in words is "three hundred eighty-one million, five hundred fifty-four thousand, seven hundred seventy-eight".