405401380 has 24 divisors (see below), whose sum is σ = 901422648. Its totient is φ = 152621568.

The previous prime is 405401369. The next prime is 405401387. The reversal of 405401380 is 83104504.

It can be written as a sum of positive squares in 4 ways, for example, as 105349696 + 300051684 = 10264^2 + 17322^2 .

It is not an unprimeable number, because it can be changed into a prime (405401387) 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, 595839 + ... + 596518.

It is an arithmetic number, because the mean of its divisors is an integer number (37559277).

Almost surely, 2^405401380 is an apocalyptic number.

It is an amenable number.

405401380 is an abundant number, since it is smaller than the sum of its proper divisors (496021268).

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

405401380 is a wasteful number, since it uses less digits than its factorization.

405401380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192383 (or 1192381 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 405401380 is about 20134.5816941897. The cubic root of 405401380 is about 740.1079584396.

Adding to 405401380 its reverse (83104504), we get a palindrome (488505884).

The spelling of 405401380 in words is "four hundred five million, four hundred one thousand, three hundred eighty".