16972390426 has 4 divisors (see below), whose sum is σ = 25458585642. Its totient is φ = 8486195212.

The previous prime is 16972390423. The next prime is 16972390439. The reversal of 16972390426 is 62409327961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14226525625 + 2745864801 = 119275^2 + 52401^2 .

It is a super-2 number, since 2×16972390426² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 16972390426.

It is not an unprimeable number, because it can be changed into a prime (16972390423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4243097605 + ... + 4243097608.

Almost surely, 2^16972390426 is an apocalyptic number.

16972390426 is a deficient number, since it is larger than the sum of its proper divisors (8486195216).

16972390426 is an equidigital number, since it uses as much as digits as its factorization.

16972390426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8486195215.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 16972390426 in words is "sixteen billion, nine hundred seventy-two million, three hundred ninety thousand, four hundred twenty-six".