155640540 has 96 divisors (see below), whose sum is σ = 496129536. Its totient is φ = 36087040.

The previous prime is 155640539. The next prime is 155640581. The reversal of 155640540 is 45046551.

155640540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 155640498 and 155640507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10054 + ... + 20306.

It is an arithmetic number, because the mean of its divisors is an integer number (5168016).

Almost surely, 2^155640540 is an apocalyptic number.

155640540 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 155640540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248064768).

155640540 is an abundant number, since it is smaller than the sum of its proper divisors (340488996).

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

155640540 is a wasteful number, since it uses less digits than its factorization.

155640540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10299 (or 10297 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 155640540 is about 12475.5977812688. The cubic root of 155640540 is about 537.9074710852.

The spelling of 155640540 in words is "one hundred fifty-five million, six hundred forty thousand, five hundred forty".