405976340 has 48 divisors (see below), whose sum is σ = 1062923904. Its totient is φ = 126537600.

The previous prime is 405976313. The next prime is 405976369. The reversal of 405976340 is 43679504.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 405976294 and 405976303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130271 + ... + 133350.

It is an arithmetic number, because the mean of its divisors is an integer number (22144248).

Almost surely, 2^405976340 is an apocalyptic number.

It is an amenable number.

405976340 is an abundant number, since it is smaller than the sum of its proper divisors (656947564).

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

405976340 is a wasteful number, since it uses less digits than its factorization.

405976340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263648 (or 263646 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 405976340 is about 20148.8545580140. The cubic root of 405976340 is about 740.4576788902.

The spelling of 405976340 in words is "four hundred five million, nine hundred seventy-six thousand, three hundred forty".