1321940457 has 12 divisors (see below), whose sum is σ = 1923208560. Its totient is φ = 874952568.

The previous prime is 1321940453. The next prime is 1321940507. The reversal of 1321940457 is 7540491231.

1321940457 is a `hidden beast` number, since 13 + 2 + 194 + 0 + 457 = 666.

It is not a de Polignac number, because 1321940457 - 2² = 1321940453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321940453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 527103 + ... + 529604.

It is an arithmetic number, because the mean of its divisors is an integer number (160267380).

Almost surely, 2^1321940457 is an apocalyptic number.

It is an amenable number.

1321940457 is a deficient number, since it is larger than the sum of its proper divisors (601268103).

1321940457 is a wasteful number, since it uses less digits than its factorization.

1321940457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056852 (or 1056849 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1321940457 is about 36358.4991026857. The cubic root of 1321940457 is about 1097.4985741373.

The spelling of 1321940457 in words is "one billion, three hundred twenty-one million, nine hundred forty thousand, four hundred fifty-seven".