1621925340 has 384 divisors, whose sum is σ = 5699635200. Its totient is φ = 336752640.

The previous prime is 1621925321. The next prime is 1621925353. The reversal of 1621925340 is 435291261.

1621925340 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 26588910 + ... + 26588970.

It is an arithmetic number, because the mean of its divisors is an integer number (14842800).

Almost surely, 2^1621925340 is an apocalyptic number.

1621925340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621925340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2849817600).

1621925340 is an abundant number, since it is smaller than the sum of its proper divisors (4077709860).

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

1621925340 is a wasteful number, since it uses less digits than its factorization.

1621925340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 1621925340 is about 40273.1342212150. The cubic root of 1621925340 is about 1174.9253829182.

The spelling of 1621925340 in words is "one billion, six hundred twenty-one million, nine hundred twenty-five thousand, three hundred forty".