155640436 has 24 divisors (see below), whose sum is σ = 317157120. Its totient is φ = 65443872.

The previous prime is 155640431. The next prime is 155640439. The reversal of 155640436 is 634046551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155640431) 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 7 ways as a sum of consecutive naturals, for example, 50956 + ... + 53923.

It is an arithmetic number, because the mean of its divisors is an integer number (13214880).

Almost surely, 2^155640436 is an apocalyptic number.

It is an amenable number.

155640436 is an abundant number, since it is smaller than the sum of its proper divisors (161516684).

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

155640436 is a wasteful number, since it uses less digits than its factorization.

155640436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104943 (or 104941 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 155640436 is about 12475.5936131312. The cubic root of 155640436 is about 537.9073512741.

Adding to 155640436 its reverse (634046551), we get a palindrome (789686987).

The spelling of 155640436 in words is "one hundred fifty-five million, six hundred forty thousand, four hundred thirty-six".