1621240830 has 48 divisors (see below), whose sum is σ = 4598431344. Its totient is φ = 393027840.

The previous prime is 1621240807. The next prime is 1621240837. The reversal of 1621240830 is 380421261.

1621240830 is a `hidden beast` number, since 1 + 621 + 2 + 4 + 0 + 8 + 30 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1621240794 and 1621240803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621240837) 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, 817819 + ... + 819798.

It is an arithmetic number, because the mean of its divisors is an integer number (95800653).

Almost surely, 2^1621240830 is an apocalyptic number.

1621240830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1621240830 is an abundant number, since it is smaller than the sum of its proper divisors (2977190514).

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

1621240830 is a wasteful number, since it uses less digits than its factorization.

1621240830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637641 (or 1637638 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1621240830 is about 40264.6349790980. The cubic root of 1621240830 is about 1174.7600729373.

The spelling of 1621240830 in words is "one billion, six hundred twenty-one million, two hundred forty thousand, eight hundred thirty".