1321047920 has 40 divisors (see below), whose sum is σ = 3108457296. Its totient is φ = 522050048.

The previous prime is 1321047907. The next prime is 1321047943. The reversal of 1321047920 is 297401231.

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, 92837 + ... + 106116.

Almost surely, 2^1321047920 is an apocalyptic number.

1321047920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321047920 is an abundant number, since it is smaller than the sum of its proper divisors (1787409376).

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

1321047920 is a wasteful number, since it uses less digits than its factorization.

1321047920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199049 (or 199043 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1321047920 is about 36346.2229124293. Note that the first 3 decimals coincide. The cubic root of 1321047920 is about 1097.2515184753.

The spelling of 1321047920 in words is "one billion, three hundred twenty-one million, forty-seven thousand, nine hundred twenty".