1621364540 has 12 divisors (see below), whose sum is σ = 3404865576. Its totient is φ = 648545808.

The previous prime is 1621364533. The next prime is 1621364551. The reversal of 1621364540 is 454631261.

It is a junction number, because it is equal to n+sod(n) for n = 1621364497 and 1621364506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40534094 + ... + 40534133.

It is an arithmetic number, because the mean of its divisors is an integer number (283738798).

Almost surely, 2^1621364540 is an apocalyptic number.

1621364540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621364540 is an abundant number, since it is smaller than the sum of its proper divisors (1783501036).

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

1621364540 is a wasteful number, since it uses less digits than its factorization.

1621364540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81068236 (or 81068234 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1621364540 is about 40266.1711614104. The cubic root of 1621364540 is about 1174.7899524941.

The spelling of 1621364540 in words is "one billion, six hundred twenty-one million, three hundred sixty-four thousand, five hundred forty".