1621046406 has 32 divisors (see below), whose sum is σ = 3717116928. Its totient is φ = 461672640.

The previous prime is 1621046353. The next prime is 1621046411. The reversal of 1621046406 is 6046401261.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48510 + ... + 74801.

It is an arithmetic number, because the mean of its divisors is an integer number (116159904).

Almost surely, 2^1621046406 is an apocalyptic number.

1621046406 is an abundant number, since it is smaller than the sum of its proper divisors (2096070522).

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

1621046406 is a wasteful number, since it uses less digits than its factorization.

1621046406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123636.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1621046406 is about 40262.2205795955. The cubic root of 1621046406 is about 1174.7131108247.

Adding to 1621046406 its reverse (6046401261), we get a palindrome (7667447667).

The spelling of 1621046406 in words is "one billion, six hundred twenty-one million, forty-six thousand, four hundred six".