1220374640 has 40 divisors (see below), whose sum is σ = 2838932880. Its totient is φ = 487881216.

The previous prime is 1220374637. The next prime is 1220374657. The reversal of 1220374640 is 464730221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209852 + ... + 215588.

It is an arithmetic number, because the mean of its divisors is an integer number (70973322).

Almost surely, 2^1220374640 is an apocalyptic number.

1220374640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220374640 is an abundant number, since it is smaller than the sum of its proper divisors (1618558240).

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

1220374640 is a wasteful number, since it uses less digits than its factorization.

1220374640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409 (or 8403 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 1220374640 is about 34933.8609374916. The cubic root of 1220374640 is about 1068.6390943589.

The spelling of 1220374640 in words is "one billion, two hundred twenty million, three hundred seventy-four thousand, six hundred forty".