1621220346 has 20 divisors (see below), whose sum is σ = 3632734842. Its totient is φ = 540406728.

The previous prime is 1621220327. The next prime is 1621220347. The reversal of 1621220346 is 6430221261.

1621220346 is a `hidden beast` number, since 1 + 621 + 2 + 2 + 0 + 34 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1032915321 + 588305025 = 32139^2 + 24255^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1621220347) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 5003605 + ... + 5003928.

Almost surely, 2^1621220346 is an apocalyptic number.

1621220346 is an abundant number, since it is smaller than the sum of its proper divisors (2011514496).

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

1621220346 is a wasteful number, since it uses less digits than its factorization.

1621220346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10007547 (or 10007538 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1621220346 is about 40264.3806111556. The cubic root of 1621220346 is about 1174.7551253099.

The spelling of 1621220346 in words is "one billion, six hundred twenty-one million, two hundred twenty thousand, three hundred forty-six".