405131620 has 12 divisors (see below), whose sum is σ = 850776444. Its totient is φ = 162052640.

The previous prime is 405131603. The next prime is 405131633. The reversal of 405131620 is 26131504.

It can be written as a sum of positive squares in 2 ways, for example, as 279825984 + 125305636 = 16728^2 + 11194^2 .

It is a junction number, because it is equal to n+sod(n) for n = 405131591 and 405131600.

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, 10128271 + ... + 10128310.

It is an arithmetic number, because the mean of its divisors is an integer number (70898037).

Almost surely, 2^405131620 is an apocalyptic number.

It is an amenable number.

405131620 is an abundant number, since it is smaller than the sum of its proper divisors (445644824).

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

405131620 is a wasteful number, since it uses less digits than its factorization.

405131620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20256590 (or 20256588 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 405131620 is about 20127.8816570448. The cubic root of 405131620 is about 739.9437624660.

The spelling of 405131620 in words is "four hundred five million, one hundred thirty-one thousand, six hundred twenty".