1655649240 has 288 divisors, whose sum is σ = 5990649840. Its totient is φ = 364976640.

The previous prime is 1655649157. The next prime is 1655649257. The reversal of 1655649240 is 429465561.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1655649192 and 1655649201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5650534 + ... + 5650826.

Almost surely, 2^1655649240 is an apocalyptic number.

1655649240 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 1655649240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2995324920).

1655649240 is an abundant number, since it is smaller than the sum of its proper divisors (4335000600).

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

1655649240 is a wasteful number, since it uses less digits than its factorization.

1655649240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The square root of 1655649240 is about 40689.6699421364. The cubic root of 1655649240 is about 1183.0128028679.

The spelling of 1655649240 in words is "one billion, six hundred fifty-five million, six hundred forty-nine thousand, two hundred forty".