155515240 has 16 divisors (see below), whose sum is σ = 349909380. Its totient is φ = 62206080.

The previous prime is 155515237. The next prime is 155515249. The reversal of 155515240 is 42515551.

It can be written as a sum of positive squares in 2 ways, for example, as 153809604 + 1705636 = 12402^2 + 1306^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155515199 and 155515208.

It is not an unprimeable number, because it can be changed into a prime (155515249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1943901 + ... + 1943980.

Almost surely, 2^155515240 is an apocalyptic number.

155515240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155515240 is an abundant number, since it is smaller than the sum of its proper divisors (194394140).

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

155515240 is a wasteful number, since it uses less digits than its factorization.

155515240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887892 (or 3887888 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 155515240 is about 12470.5749666966. The cubic root of 155515240 is about 537.7630830374.

The spelling of 155515240 in words is "one hundred fifty-five million, five hundred fifteen thousand, two hundred forty".