155440008 has 24 divisors (see below), whose sum is σ = 420983550. Its totient is φ = 51813312.

The previous prime is 155439961. The next prime is 155440009. The reversal of 155440008 is 800044551.

It can be written as a sum of positive squares in only one way, i.e., 154703844 + 736164 = 12438^2 + 858^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (155440009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1079373 + ... + 1079516.

Almost surely, 2^155440008 is an apocalyptic number.

155440008 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

155440008 is an abundant number, since it is smaller than the sum of its proper divisors (265543542).

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

155440008 is a wasteful number, since it uses less digits than its factorization.

155440008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158901 (or 2158894 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 155440008 is about 12467.5582212396. The cubic root of 155440008 is about 537.6763530213.

Adding to 155440008 its reverse (800044551), we get a palindrome (955484559).

The spelling of 155440008 in words is "one hundred fifty-five million, four hundred forty thousand, eight".