1642723438 has 8 divisors (see below), whose sum is σ = 2464698600. Its totient is φ = 821157240.

The previous prime is 1642723429. The next prime is 1642723501. The reversal of 1642723438 is 8343272461.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1642723438.

It is a congruent number.

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, 91993 + ... + 108388.

It is an arithmetic number, because the mean of its divisors is an integer number (308087325).

Almost surely, 2^1642723438 is an apocalyptic number.

1642723438 is a deficient number, since it is larger than the sum of its proper divisors (821975162).

1642723438 is a wasteful number, since it uses less digits than its factorization.

1642723438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204482.

The product of its digits is 193536, while the sum is 40.

The square root of 1642723438 is about 40530.5247683767. The cubic root of 1642723438 is about 1179.9261272340.

Adding to 1642723438 its reverse (8343272461), we get a palindrome (9985995899).

The spelling of 1642723438 in words is "one billion, six hundred forty-two million, seven hundred twenty-three thousand, four hundred thirty-eight".