155461440 has 112 divisors (see below), whose sum is σ = 501164352. Its totient is φ = 40820736.

The previous prime is 155461429. The next prime is 155461441. The reversal of 155461440 is 44164551.

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 = 155461398 and 155461407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155461441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63112 + ... + 65528.

Almost surely, 2^155461440 is an apocalyptic number.

155461440 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 155461440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250582176).

155461440 is an abundant number, since it is smaller than the sum of its proper divisors (345702912).

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

155461440 is a wasteful number, since it uses less digits than its factorization.

155461440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504 (or 2494 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 155461440 is about 12468.4177023390. The cubic root of 155461440 is about 537.7010634120.

The spelling of 155461440 in words is "one hundred fifty-five million, four hundred sixty-one thousand, four hundred forty".