405431490 has 32 divisors (see below), whose sum is σ = 983975040. Its totient is φ = 106899584.

The previous prime is 405431479. The next prime is 405431491. The reversal of 405431490 is 94134504.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (405431491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73254 + ... + 78593.

It is an arithmetic number, because the mean of its divisors is an integer number (30749220).

Almost surely, 2^405431490 is an apocalyptic number.

405431490 is an abundant number, since it is smaller than the sum of its proper divisors (578543550).

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

405431490 is a wasteful number, since it uses less digits than its factorization.

405431490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151946.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 405431490 is about 20135.3293988452. The cubic root of 405431490 is about 740.1262811029.

Adding to 405431490 its reverse (94134504), we get a palindrome (499565994).

The spelling of 405431490 in words is "four hundred five million, four hundred thirty-one thousand, four hundred ninety".