1407545721 has 8 divisors (see below), whose sum is σ = 2085252960. Its totient is φ = 938363796.

The previous prime is 1407545701. The next prime is 1407545723. The reversal of 1407545721 is 1275457041.

1407545721 is a `hidden beast` number, since 1 + 40 + 7 + 545 + 72 + 1 = 666.

It is not a de Polignac number, because 1407545721 - 2¹⁴ = 1407529337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1407545723) 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, 26065635 + ... + 26065688.

It is an arithmetic number, because the mean of its divisors is an integer number (260656620).

Almost surely, 2^1407545721 is an apocalyptic number.

It is an amenable number.

1407545721 is a deficient number, since it is larger than the sum of its proper divisors (677707239).

1407545721 is an equidigital number, since it uses as much as digits as its factorization.

1407545721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52131332 (or 52131326 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 1407545721 is about 37517.2723022343. The cubic root of 1407545721 is about 1120.6951788012.

The spelling of 1407545721 in words is "one billion, four hundred seven million, five hundred forty-five thousand, seven hundred twenty-one".