405343840 has 48 divisors (see below), whose sum is σ = 1044686160. Its totient is φ = 147397120.

The previous prime is 405343823. The next prime is 405343847. The reversal of 405343840 is 48343504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405343847) 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, 113395 + ... + 116914.

It is an arithmetic number, because the mean of its divisors is an integer number (21764295).

Almost surely, 2^405343840 is an apocalyptic number.

405343840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405343840 is an abundant number, since it is smaller than the sum of its proper divisors (639342320).

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

405343840 is a wasteful number, since it uses less digits than its factorization.

405343840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230335 (or 230327 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 405343840 is about 20133.1527585721. The cubic root of 405343840 is about 740.0729414343.

The spelling of 405343840 in words is "four hundred five million, three hundred forty-three thousand, eight hundred forty".