155384640 has 168 divisors, whose sum is σ = 539361888. Its totient is φ = 41057280.

The previous prime is 155384633. The next prime is 155384657. The reversal of 155384640 is 46483551.

It is a happy number.

155384640 is a `hidden beast` number, since 1 + 5 + 5 + 3 + 8 + 4 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 155384595 and 155384604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469275 + ... + 469605.

Almost surely, 2^155384640 is an apocalyptic number.

155384640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155384640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269680944).

155384640 is an abundant number, since it is smaller than the sum of its proper divisors (383977248).

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

155384640 is a wasteful number, since it uses less digits than its factorization.

155384640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 155384640 is about 12465.3375405562. The cubic root of 155384640 is about 537.6125050237.

The spelling of 155384640 in words is "one hundred fifty-five million, three hundred eighty-four thousand, six hundred forty".