1357321820 has 24 divisors (see below), whose sum is σ = 3018045744. Its totient is φ = 510991616.

The previous prime is 1357321813. The next prime is 1357321841. The reversal of 1357321820 is 281237531.

It is a super-2 number, since 2×1357321820² = 3684645046096224800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1995722 + ... + 1996401.

It is an arithmetic number, because the mean of its divisors is an integer number (125751906).

Almost surely, 2^1357321820 is an apocalyptic number.

1357321820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1357321820 is an abundant number, since it is smaller than the sum of its proper divisors (1660723924).

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

1357321820 is a wasteful number, since it uses less digits than its factorization.

1357321820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3992149 (or 3992147 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1357321820 is about 36841.8487592575. The cubic root of 1357321820 is about 1107.2039086377.

The spelling of 1357321820 in words is "one billion, three hundred fifty-seven million, three hundred twenty-one thousand, eight hundred twenty".