155540236 has 6 divisors (see below), whose sum is σ = 272195420. Its totient is φ = 77770116.

The previous prime is 155540221. The next prime is 155540239. The reversal of 155540236 is 632045551.

It is a junction number, because it is equal to n+sod(n) for n = 155540198 and 155540207.

It is not an unprimeable number, because it can be changed into a prime (155540239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19442526 + ... + 19442533.

Almost surely, 2^155540236 is an apocalyptic number.

It is an amenable number.

155540236 is a deficient number, since it is larger than the sum of its proper divisors (116655184).

155540236 is a wasteful number, since it uses less digits than its factorization.

155540236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38885063 (or 38885061 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 155540236 is about 12471.5771256085. The cubic root of 155540236 is about 537.7918930883.

Adding to 155540236 its reverse (632045551), we get a palindrome (787585787).

The spelling of 155540236 in words is "one hundred fifty-five million, five hundred forty thousand, two hundred thirty-six".