155149940 has 48 divisors (see below), whose sum is σ = 361488960. Its totient is φ = 55457280.

The previous prime is 155149937. The next prime is 155149963. The reversal of 155149940 is 49941551.

155149940 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 155149894 and 155149903.

It is a congruent number.

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, 7004 + ... + 18956.

It is an arithmetic number, because the mean of its divisors is an integer number (7531020).

Almost surely, 2^155149940 is an apocalyptic number.

155149940 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 155149940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180744480).

155149940 is an abundant number, since it is smaller than the sum of its proper divisors (206339020).

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

155149940 is a wasteful number, since it uses less digits than its factorization.

155149940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12032 (or 12030 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 155149940 is about 12455.9198777128. The cubic root of 155149940 is about 537.3416905330.

The spelling of 155149940 in words is "one hundred fifty-five million, one hundred forty-nine thousand, nine hundred forty".