155120940 has 192 divisors, whose sum is σ = 547545600. Its totient is φ = 36142848.

The previous prime is 155120887. The next prime is 155120981. The reversal of 155120940 is 49021551.

155120940 is a `hidden beast` number, since 1 + 551 + 20 + 94 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 132799 + ... + 133961.

It is an arithmetic number, because the mean of its divisors is an integer number (2851800).

Almost surely, 2^155120940 is an apocalyptic number.

155120940 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 155120940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273772800).

155120940 is an abundant number, since it is smaller than the sum of its proper divisors (392424660).

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

155120940 is a wasteful number, since it uses less digits than its factorization.

155120940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213 (or 1205 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 155120940 is about 12454.7557181986. The cubic root of 155120940 is about 537.3082092009.

The spelling of 155120940 in words is "one hundred fifty-five million, one hundred twenty thousand, nine hundred forty".