1642404906 has 12 divisors (see below), whose sum is σ = 3558544002. Its totient is φ = 547468296.

The previous prime is 1642404899. The next prime is 1642404917. The reversal of 1642404906 is 6094042461.

1642404906 is a `hidden beast` number, since 1 + 642 + 4 + 0 + 4 + 9 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1273419225 + 368985681 = 35685^2 + 19209^2 .

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, 45622341 + ... + 45622376.

Almost surely, 2^1642404906 is an apocalyptic number.

1642404906 is an abundant number, since it is smaller than the sum of its proper divisors (1916139096).

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

1642404906 is a wasteful number, since it uses less digits than its factorization.

1642404906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91244725 (or 91244722 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1642404906 is about 40526.5950457228. The cubic root of 1642404906 is about 1179.8498578479.

The spelling of 1642404906 in words is "one billion, six hundred forty-two million, four hundred four thousand, nine hundred six".