1642394923 has 8 divisors (see below), whose sum is σ = 1770739488. Its totient is φ = 1514337024.

The previous prime is 1642394917. The next prime is 1642395031. The reversal of 1642394923 is 3294932461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1642394923 - 2¹³ = 1642386731 is a prime.

It is a super-2 number, since 2×1642394923² = 5394922166192351858, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1642394923.

It is not an unprimeable number, because it can be changed into a prime (1642394723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59686 + ... + 82747.

It is an arithmetic number, because the mean of its divisors is an integer number (221342436).

Almost surely, 2^1642394923 is an apocalyptic number.

1642394923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1642394923 is a deficient number, since it is larger than the sum of its proper divisors (128344565).

1642394923 is a wasteful number, since it uses less digits than its factorization.

1642394923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143333.

The product of its digits is 279936, while the sum is 43.

The square root of 1642394923 is about 40526.4718795012. The cubic root of 1642394923 is about 1179.8474673564.

The spelling of 1642394923 in words is "one billion, six hundred forty-two million, three hundred ninety-four thousand, nine hundred twenty-three".