1538228790 has 192 divisors, whose sum is σ = 4860311040. Its totient is φ = 329702400.

The previous prime is 1538228789. The next prime is 1538228851. The reversal of 1538228790 is 978228351.

It is a happy number.

1538228790 is a `hidden beast` number, since 1 + 538 + 2 + 28 + 7 + 90 = 666.

It is a super-2 number, since 2×1538228790² = 4732295620769728200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 95 ways as a sum of consecutive naturals, for example, 1280190 + ... + 1281390.

It is an arithmetic number, because the mean of its divisors is an integer number (25314120).

Almost surely, 2^1538228790 is an apocalyptic number.

1538228790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1538228790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2430155520).

1538228790 is an abundant number, since it is smaller than the sum of its proper divisors (3322082250).

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

1538228790 is a wasteful number, since it uses less digits than its factorization.

1538228790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347 (or 1344 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1538228790 is about 39220.2599430447. The cubic root of 1538228790 is about 1154.3574544927.

The spelling of 1538228790 in words is "one billion, five hundred thirty-eight million, two hundred twenty-eight thousand, seven hundred ninety".