405240980 has 12 divisors (see below), whose sum is σ = 851006100. Its totient is φ = 162096384.

The previous prime is 405240977. The next prime is 405241009. The reversal of 405240980 is 89042504.

It can be written as a sum of positive squares in 2 ways, for example, as 170354704 + 234886276 = 13052^2 + 15326^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10131005 + ... + 10131044.

It is an arithmetic number, because the mean of its divisors is an integer number (70917175).

Almost surely, 2^405240980 is an apocalyptic number.

It is an amenable number.

405240980 is an abundant number, since it is smaller than the sum of its proper divisors (445765120).

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

405240980 is a wasteful number, since it uses less digits than its factorization.

405240980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20262058 (or 20262056 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 405240980 is about 20130.5981033848. The cubic root of 405240980 is about 740.0103358673.

The spelling of 405240980 in words is "four hundred five million, two hundred forty thousand, nine hundred eighty".