155239487 has 4 divisors (see below), whose sum is σ = 167181000. Its totient is φ = 143297976.

The previous prime is 155239477. The next prime is 155239499. The reversal of 155239487 is 784932551.

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

It is a cyclic number.

It is not a de Polignac number, because 155239487 - 2⁴ = 155239471 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 (155239477) 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, 5970737 + ... + 5970762.

It is an arithmetic number, because the mean of its divisors is an integer number (41795250).

Almost surely, 2^155239487 is an apocalyptic number.

155239487 is a deficient number, since it is larger than the sum of its proper divisors (11941513).

155239487 is a wasteful number, since it uses less digits than its factorization.

155239487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11941512.

The product of its digits is 302400, while the sum is 44.

The square root of 155239487 is about 12459.5139150771. The cubic root of 155239487 is about 537.4450487901.

The spelling of 155239487 in words is "one hundred fifty-five million, two hundred thirty-nine thousand, four hundred eighty-seven".