1221474040 has 32 divisors (see below), whose sum is σ = 2800176480. Its totient is φ = 479370112.

The previous prime is 1221474031. The next prime is 1221474043. The reversal of 1221474040 is 404741221.

It is a junction number, because it is equal to n+sod(n) for n = 1221473996 and 1221474014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221474043) 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, 285964 + ... + 290203.

It is an arithmetic number, because the mean of its divisors is an integer number (87505515).

Almost surely, 2^1221474040 is an apocalyptic number.

1221474040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221474040 is an abundant number, since it is smaller than the sum of its proper divisors (1578702440).

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

1221474040 is a wasteful number, since it uses less digits than its factorization.

1221474040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576231 (or 576227 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 1221474040 is about 34949.5928445526. The cubic root of 1221474040 is about 1068.9598999975.

The spelling of 1221474040 in words is "one billion, two hundred twenty-one million, four hundred seventy-four thousand, forty".