409921138 has 12 divisors (see below), whose sum is σ = 675862110. Its totient is φ = 186327680.

The previous prime is 409921103. The next prime is 409921189. The reversal of 409921138 is 831129904.

It can be written as a sum of positive squares in only one way, i.e., 406546569 + 3374569 = 20163^2 + 1837^2 .

It is a junction number, because it is equal to n+sod(n) for n = 409921097 and 409921106.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 846703 + ... + 847186.

Almost surely, 2^409921138 is an apocalyptic number.

409921138 is a deficient number, since it is larger than the sum of its proper divisors (265940972).

409921138 is a wasteful number, since it uses less digits than its factorization.

409921138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693913 (or 1693902 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 409921138 is about 20246.5092793795. The cubic root of 409921138 is about 742.8482499886.

The spelling of 409921138 in words is "four hundred nine million, nine hundred twenty-one thousand, one hundred thirty-eight".