155723234 has 4 divisors (see below), whose sum is σ = 233584854. Its totient is φ = 77861616.

The previous prime is 155723233. The next prime is 155723251. The reversal of 155723234 is 432327551.

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., 131171209 + 24552025 = 11453^2 + 4955^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155723234.

It is not an unprimeable number, because it can be changed into a prime (155723233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38930807 + ... + 38930810.

Almost surely, 2^155723234 is an apocalyptic number.

155723234 is a deficient number, since it is larger than the sum of its proper divisors (77861620).

155723234 is an equidigital number, since it uses as much as digits as its factorization.

155723234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77861619.

The product of its digits is 25200, while the sum is 32.

The square root of 155723234 is about 12478.9115711267. The cubic root of 155723234 is about 538.0027201440.

The spelling of 155723234 in words is "one hundred fifty-five million, seven hundred twenty-three thousand, two hundred thirty-four".