1999640007 has 8 divisors (see below), whose sum is σ = 2962429680. Its totient is φ = 1333093320.

The previous prime is 1999639979. The next prime is 1999640023. The reversal of 1999640007 is 7000469991.

It is not a de Polignac number, because 1999640007 - 2¹⁶ = 1999574471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999640057) 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, 37030344 + ... + 37030397.

It is an arithmetic number, because the mean of its divisors is an integer number (370303710).

Almost surely, 2^1999640007 is an apocalyptic number.

1999640007 is a deficient number, since it is larger than the sum of its proper divisors (962789673).

1999640007 is an equidigital number, since it uses as much as digits as its factorization.

1999640007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74060750 (or 74060744 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 1999640007 is about 44717.3345247679. The cubic root of 1999640007 is about 1259.8454515658.

The spelling of 1999640007 in words is "one billion, nine hundred ninety-nine million, six hundred forty thousand, seven".