155023439 has 4 divisors (see below), whose sum is σ = 156244224. Its totient is φ = 153802656.

The previous prime is 155023417. The next prime is 155023441. The reversal of 155023439 is 934320551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934320551 = 10181 ⋅91771.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155023439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155023139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610202 + ... + 610455.

It is an arithmetic number, because the mean of its divisors is an integer number (39061056).

Almost surely, 2^155023439 is an apocalyptic number.

155023439 is a deficient number, since it is larger than the sum of its proper divisors (1220785).

155023439 is a wasteful number, since it uses less digits than its factorization.

155023439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220784.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 155023439 is about 12450.8408952970. The cubic root of 155023439 is about 537.1956108895.

The spelling of 155023439 in words is "one hundred fifty-five million, twenty-three thousand, four hundred thirty-nine".