1538420508 has 144 divisors (see below), whose sum is σ = 4289725440. Its totient is φ = 462758400.

The previous prime is 1538420501. The next prime is 1538420531. The reversal of 1538420508 is 8050248351.

It is a happy number.

1538420508 is a `hidden beast` number, since 1 + 53 + 84 + 20 + 508 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538420501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2485023 + ... + 2485641.

It is an arithmetic number, because the mean of its divisors is an integer number (29789760).

Almost surely, 2^1538420508 is an apocalyptic number.

1538420508 is a gapful number since it is divisible by the number (18) 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 1538420508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2144862720).

1538420508 is an abundant number, since it is smaller than the sum of its proper divisors (2751304932).

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

1538420508 is a wasteful number, since it uses less digits than its factorization.

1538420508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 803 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 1538420508 is about 39222.7039863393. The cubic root of 1538420508 is about 1154.4054104947.

Adding to 1538420508 its reverse (8050248351), we get a palindrome (9588668859).

The spelling of 1538420508 in words is "one billion, five hundred thirty-eight million, four hundred twenty thousand, five hundred eight".