161538426 has 24 divisors (see below), whose sum is σ = 400000224. Its totient is φ = 46153800.

The previous prime is 161538413. The next prime is 161538463. The reversal of 161538426 is 624835161.

It is a happy number.

161538426 is a `hidden beast` number, since 1 + 615 + 38 + 4 + 2 + 6 = 666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 640900 + ... + 641151.

It is an arithmetic number, because the mean of its divisors is an integer number (16666676).

Almost surely, 2^161538426 is an apocalyptic number.

161538426 is an abundant number, since it is smaller than the sum of its proper divisors (238461798).

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

161538426 is a wasteful number, since it uses less digits than its factorization.

161538426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282066 (or 1282063 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 161538426 is about 12709.7767879692. The cubic root of 161538426 is about 544.6179473156.

The spelling of 161538426 in words is "one hundred sixty-one million, five hundred thirty-eight thousand, four hundred twenty-six".