155504040 has 32 divisors (see below), whose sum is σ = 466512480. Its totient is φ = 41467712.

The previous prime is 155504023. The next prime is 155504057. The reversal of 155504040 is 40405551.

It is an interprime number because it is at equal distance from previous prime (155504023) and next prime (155504057).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 155504040.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647814 + ... + 648053.

It is an arithmetic number, because the mean of its divisors is an integer number (14578515).

Almost surely, 2^155504040 is an apocalyptic number.

155504040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155504040 is an abundant number, since it is smaller than the sum of its proper divisors (311008440).

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

155504040 is a wasteful number, since it uses less digits than its factorization.

155504040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295881 (or 1295877 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 155504040 is about 12470.1259015296. The cubic root of 155504040 is about 537.7501730677.

Adding to 155504040 its reverse (40405551), we get a palindrome (195909591).

It can be divided in two parts, 15 and 5504040, that added together give a palindrome (5504055).

The spelling of 155504040 in words is "one hundred fifty-five million, five hundred four thousand, forty".