1221948 has 72 divisors (see below), whose sum is σ = 3811808. Its totient is φ = 321408.

The previous prime is 1221937. The next prime is 1221959. The reversal of 1221948 is 8491221.

It is an interprime number because it is at equal distance from previous prime (1221937) and next prime (1221959).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3090 + ... + 3462.

2^1221948 is an apocalyptic number.

1221948 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905904).

1221948 is an abundant number, since it is smaller than the sum of its proper divisors (2589860).

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

1221948 is a wasteful number, since it uses less digits than its factorization.

1221948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 398 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1221948 is about 1105.4175681615. The cubic root of 1221948 is about 106.9098142455.

The spelling of 1221948 in words is "one million, two hundred twenty-one thousand, nine hundred forty-eight".