155989040 has 80 divisors (see below), whose sum is σ = 376017600. Its totient is φ = 60134400.

The previous prime is 155989037. The next prime is 155989061. The reversal of 155989040 is 40989551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446786 + ... + 447134.

It is an arithmetic number, because the mean of its divisors is an integer number (4700220).

Almost surely, 2^155989040 is an apocalyptic number.

155989040 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 155989040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188008800).

155989040 is an abundant number, since it is smaller than the sum of its proper divisors (220028560).

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

155989040 is a wasteful number, since it uses less digits than its factorization.

155989040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 155989040 is about 12489.5572379488. The cubic root of 155989040 is about 538.3086540737.

The spelling of 155989040 in words is "one hundred fifty-five million, nine hundred eighty-nine thousand, forty".