405239380 has 48 divisors (see below), whose sum is σ = 1047392640. Its totient is φ = 128251008.

The previous prime is 405239363. The next prime is 405239381. The reversal of 405239380 is 83932504.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405239381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109510 + ... + 113149.

It is an arithmetic number, because the mean of its divisors is an integer number (21820680).

Almost surely, 2^405239380 is an apocalyptic number.

It is an amenable number.

405239380 is an abundant number, since it is smaller than the sum of its proper divisors (642153260).

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

405239380 is a wasteful number, since it uses less digits than its factorization.

405239380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222688 (or 222686 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 405239380 is about 20130.5583628473. The cubic root of 405239380 is about 740.0093619463.

The spelling of 405239380 in words is "four hundred five million, two hundred thirty-nine thousand, three hundred eighty".