1407721687 has 4 divisors (see below), whose sum is σ = 1453132096. Its totient is φ = 1362311280.

The previous prime is 1407721673. The next prime is 1407721727. The reversal of 1407721687 is 7861277041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7861277041 = 4523 ⋅1738067.

It is a cyclic number.

It is not a de Polignac number, because 1407721687 - 2¹¹ = 1407719639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1407721607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22705158 + ... + 22705219.

It is an arithmetic number, because the mean of its divisors is an integer number (363283024).

Almost surely, 2^1407721687 is an apocalyptic number.

1407721687 is a deficient number, since it is larger than the sum of its proper divisors (45410409).

1407721687 is an equidigital number, since it uses as much as digits as its factorization.

1407721687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45410408.

The product of its (nonzero) digits is 131712, while the sum is 43.

The square root of 1407721687 is about 37519.6173621214. The cubic root of 1407721687 is about 1120.7418785348.

The spelling of 1407721687 in words is "one billion, four hundred seven million, seven hundred twenty-one thousand, six hundred eighty-seven".