1621040445 has 40 divisors (see below), whose sum is σ = 2973475296. Its totient is φ = 844439904.

The previous prime is 1621040419. The next prime is 1621040453. The reversal of 1621040445 is 5440401261.

1621040445 is a `hidden beast` number, since 1 + 6 + 210 + 4 + 0 + 445 = 666.

It is not a de Polignac number, because 1621040445 - 2¹⁵ = 1621007677 is a prime.

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

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 29127 + ... + 63956.

Almost surely, 2^1621040445 is an apocalyptic number.

1621040445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1621040445 is a deficient number, since it is larger than the sum of its proper divisors (1352434851).

1621040445 is an equidigital number, since it uses as much as digits as its factorization.

1621040445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93143 (or 93134 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1621040445 is about 40262.1465523139. The cubic root of 1621040445 is about 1174.7116709166.

The spelling of 1621040445 in words is "one billion, six hundred twenty-one million, forty thousand, four hundred forty-five".