155439506 has 8 divisors (see below), whose sum is σ = 233248140. Its totient is φ = 77690128.

The previous prime is 155439503. The next prime is 155439509. The reversal of 155439506 is 605934551.

It is an interprime number because it is at equal distance from previous prime (155439503) and next prime (155439509).

It can be written as a sum of positive squares in 2 ways, for example, as 155127025 + 312481 = 12455^2 + 559^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×155439506² = 48322880051048072, 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 155439506.

It is not an unprimeable number, because it can be changed into a prime (155439503) 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, 7541 + ... + 19176.

Almost surely, 2^155439506 is an apocalyptic number.

155439506 is a deficient number, since it is larger than the sum of its proper divisors (77808634).

155439506 is a wasteful number, since it uses less digits than its factorization.

155439506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29628.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 155439506 is about 12467.5380889733. The cubic root of 155439506 is about 537.6757742045.

The spelling of 155439506 in words is "one hundred fifty-five million, four hundred thirty-nine thousand, five hundred six".