1621473994 has 24 divisors (see below), whose sum is σ = 2830742208. Its totient is φ = 694564920.

The previous prime is 1621473983. The next prime is 1621474007. The reversal of 1621473994 is 4993741261.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307359 + ... + 312589.

It is an arithmetic number, because the mean of its divisors is an integer number (117947592).

Almost surely, 2^1621473994 is an apocalyptic number.

1621473994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1621473994 is a deficient number, since it is larger than the sum of its proper divisors (1209268214).

1621473994 is a wasteful number, since it uses less digits than its factorization.

1621473994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8410 (or 8403 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 1621473994 is about 40267.5302694367. The cubic root of 1621473994 is about 1174.8163875457.

The spelling of 1621473994 in words is "one billion, six hundred twenty-one million, four hundred seventy-three thousand, nine hundred ninety-four".