155214540 has 144 divisors (see below), whose sum is σ = 512392608. Its totient is φ = 37804032.

The previous prime is 155214529. The next prime is 155214541. The reversal of 155214540 is 45412551.

It is a super-4 number, since 4×155214540⁴ (a number of 34 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (155214541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 264127 + ... + 264713.

It is an arithmetic number, because the mean of its divisors is an integer number (3558282).

Almost surely, 2^155214540 is an apocalyptic number.

155214540 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 155214540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256196304).

155214540 is an abundant number, since it is smaller than the sum of its proper divisors (357178068).

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

155214540 is a wasteful number, since it uses less digits than its factorization.

155214540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 155214540 is about 12458.5127523312. The cubic root of 155214540 is about 537.4162580913.

The spelling of 155214540 in words is "one hundred fifty-five million, two hundred fourteen thousand, five hundred forty".