405142840 has 16 divisors (see below), whose sum is σ = 911571480. Its totient is φ = 162057120.

The previous prime is 405142831. The next prime is 405142841. The reversal of 405142840 is 48241504.

It is a junction number, because it is equal to n+sod(n) for n = 405142799 and 405142808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405142841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5064246 + ... + 5064325.

Almost surely, 2^405142840 is an apocalyptic number.

405142840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405142840 is an abundant number, since it is smaller than the sum of its proper divisors (506428640).

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

405142840 is a wasteful number, since it uses less digits than its factorization.

405142840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10128582 (or 10128578 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 405142840 is about 20128.1603729700. The cubic root of 405142840 is about 739.9505932439.

The spelling of 405142840 in words is "four hundred five million, one hundred forty-two thousand, eight hundred forty".