16239400428 has 18 divisors (see below), whose sum is σ = 37892964396. Its totient is φ = 5412986328.

The previous prime is 16239400421. The next prime is 16239400481. The reversal of 16239400428 is 82400493261.

It is not an unprimeable number, because it can be changed into a prime (16239400421) 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, 423051 + ... + 459837.

Almost surely, 2^16239400428 is an apocalyptic number.

It is an amenable number.

16239400428 is an abundant number, since it is smaller than the sum of its proper divisors (21653563968).

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

16239400428 is an frugal number, since it uses more digits than its factorization.

16239400428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73581 (or 36792 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

Adding to 16239400428 its reverse (82400493261), we get a palindrome (98639893689).

The spelling of 16239400428 in words is "sixteen billion, two hundred thirty-nine million, four hundred thousand, four hundred twenty-eight".