1221739450 has 48 divisors (see below), whose sum is σ = 2355634944. Its totient is φ = 470937600.

The previous prime is 1221739433. The next prime is 1221739451. The reversal of 1221739450 is 549371221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1221739451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 396817 + ... + 399883.

It is an arithmetic number, because the mean of its divisors is an integer number (49075728).

Almost surely, 2^1221739450 is an apocalyptic number.

1221739450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221739450 is a deficient number, since it is larger than the sum of its proper divisors (1133895494).

1221739450 is a wasteful number, since it uses less digits than its factorization.

1221739450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3367 (or 3362 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1221739450 is about 34953.3896782558. The cubic root of 1221739450 is about 1069.0373179617.

The spelling of 1221739450 in words is "one billion, two hundred twenty-one million, seven hundred thirty-nine thousand, four hundred fifty".