26161989 has 16 divisors (see below), whose sum is σ = 40115712. Its totient is φ = 14856048.

The previous prime is 26161987. The next prime is 26161999. The reversal of 26161989 is 98916162.

It is not a de Polignac number, because 26161989 - 2¹ = 26161987 is a prime.

It is a super-2 number, since 2×26161989² = 1368899336872242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26161989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26161987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399 + ... + 7244.

It is an arithmetic number, because the mean of its divisors is an integer number (2507232).

Almost surely, 2^26161989 is an apocalyptic number.

It is an amenable number.

26161989 is a deficient number, since it is larger than the sum of its proper divisors (13953723).

26161989 is a wasteful number, since it uses less digits than its factorization.

26161989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7816.

The product of its digits is 46656, while the sum is 42.

The square root of 26161989 is about 5114.8791774586. The cubic root of 26161989 is about 296.8635793797.

The spelling of 26161989 in words is "twenty-six million, one hundred sixty-one thousand, nine hundred eighty-nine".