155400040 has 16 divisors (see below), whose sum is σ = 349650180. Its totient is φ = 62160000.

The previous prime is 155400017. The next prime is 155400061. The reversal of 155400040 is 40004551.

It can be written as a sum of positive squares in 2 ways, for example, as 155301444 + 98596 = 12462^2 + 314^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155399990 and 155400017.

It is an unprimeable number.

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, 1942461 + ... + 1942540.

Almost surely, 2^155400040 is an apocalyptic number.

155400040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155400040 is an abundant number, since it is smaller than the sum of its proper divisors (194250140).

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

155400040 is a wasteful number, since it uses less digits than its factorization.

155400040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885012 (or 3885008 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 155400040 is about 12465.9552381677. The cubic root of 155400040 is about 537.6302651642.

Adding to 155400040 its reverse (40004551), we get a palindrome (195404591).

The spelling of 155400040 in words is "one hundred fifty-five million, four hundred thousand, forty".