1523213820 has 72 divisors (see below), whose sum is σ = 4624108944. Its totient is φ = 405865728.

The previous prime is 1523213807. The next prime is 1523213827. The reversal of 1523213820 is 283123251.

1523213820 is a `hidden beast` number, since 1 + 523 + 2 + 138 + 2 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1523213827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 295707 + ... + 300813.

Almost surely, 2^1523213820 is an apocalyptic number.

1523213820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1523213820 is an abundant number, since it is smaller than the sum of its proper divisors (3100895124).

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

1523213820 is a wasteful number, since it uses less digits than its factorization.

1523213820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6779 (or 6774 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1523213820 is about 39028.3719875682. The cubic root of 1523213820 is about 1150.5891927245.

The spelling of 1523213820 in words is "one billion, five hundred twenty-three million, two hundred thirteen thousand, eight hundred twenty".