1642123404 has 18 divisors (see below), whose sum is σ = 4150923140. Its totient is φ = 547374456.

The previous prime is 1642123391. The next prime is 1642123409. The reversal of 1642123404 is 4043212461.

It is a happy number.

1642123404 is a `hidden beast` number, since 1 + 6 + 421 + 234 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1642123409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22807234 + ... + 22807305.

Almost surely, 2^1642123404 is an apocalyptic number.

It is an amenable number.

1642123404 is an abundant number, since it is smaller than the sum of its proper divisors (2508799736).

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

1642123404 is a wasteful number, since it uses less digits than its factorization.

1642123404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45614549 (or 45614544 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1642123404 is about 40523.1218442015. The cubic root of 1642123404 is about 1179.7824467261.

Adding to 1642123404 its reverse (4043212461), we get a palindrome (5685335865).

The spelling of 1642123404 in words is "one billion, six hundred forty-two million, one hundred twenty-three thousand, four hundred four".