405474381 has 24 divisors (see below), whose sum is σ = 641089176. Its totient is φ = 245427840.

The previous prime is 405474371. The next prime is 405474409. The reversal of 405474381 is 183474504.

It can be written as a sum of positive squares in 4 ways, for example, as 21706281 + 383768100 = 4659^2 + 19590^2 .

It is not a de Polignac number, because 405474381 - 2⁹ = 405473869 is a prime.

It is a super-2 number, since 2×405474381² = 328818947294666322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405474371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21270 + ... + 35543.

It is an arithmetic number, because the mean of its divisors is an integer number (26712049).

Almost surely, 2^405474381 is an apocalyptic number.

It is an amenable number.

405474381 is a deficient number, since it is larger than the sum of its proper divisors (235614795).

405474381 is a wasteful number, since it uses less digits than its factorization.

405474381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56893 (or 56890 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 405474381 is about 20136.3944389258. The cubic root of 405474381 is about 740.1523797474.

The spelling of 405474381 in words is "four hundred five million, four hundred seventy-four thousand, three hundred eighty-one".