155226240 has 256 divisors, whose sum is σ = 592905600. Its totient is φ = 38154240.

The previous prime is 155226229. The next prime is 155226277. The reversal of 155226240 is 42622551.

155226240 is a `hidden beast` number, since 15 + 5 + 22 + 624 + 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 31 ways as a sum of consecutive naturals, for example, 224295 + ... + 224985.

Almost surely, 2^155226240 is an apocalyptic number.

155226240 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 155226240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296452800).

155226240 is an abundant number, since it is smaller than the sum of its proper divisors (437679360).

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

155226240 is a wasteful number, since it uses less digits than its factorization.

155226240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 155226240 is about 12458.9823019378. The cubic root of 155226240 is about 537.4297611481.

Adding to 155226240 its reverse (42622551), we get a palindrome (197848791).

The spelling of 155226240 in words is "one hundred fifty-five million, two hundred twenty-six thousand, two hundred forty".