1221940383 has 8 divisors (see below), whose sum is σ = 1629437568. Its totient is φ = 814535064.

The previous prime is 1221940381. The next prime is 1221940403. The reversal of 1221940383 is 3830491221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221940383 - 2¹ = 1221940381 is a prime.

It is a Smith number, since the sum of its digits (33) 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 not an unprimeable number, because it can be changed into a prime (1221940381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19060 + ... + 52982.

It is an arithmetic number, because the mean of its divisors is an integer number (203679696).

Almost surely, 2^1221940383 is an apocalyptic number.

1221940383 is a deficient number, since it is larger than the sum of its proper divisors (407497185).

1221940383 is a wasteful number, since it uses less digits than its factorization.

1221940383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45933.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1221940383 is about 34956.2638592856. The cubic root of 1221940383 is about 1069.0959210462.

The spelling of 1221940383 in words is "one billion, two hundred twenty-one million, nine hundred forty thousand, three hundred eighty-three".