9907621973 has 4 divisors (see below), whose sum is σ = 10249264140. Its totient is φ = 9565979808.

The previous prime is 9907621961. The next prime is 9907622003. The reversal of 9907621973 is 3791267099.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3791267099 = 1063 ⋅3566573.

It can be written as a sum of positive squares in 2 ways, for example, as 3101041969 + 6806580004 = 55687^2 + 82502^2 .

It is a cyclic number.

It is not a de Polignac number, because 9907621973 - 2¹² = 9907617877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9907621903) 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, 170821040 + ... + 170821097.

It is an arithmetic number, because the mean of its divisors is an integer number (2562316035).

Almost surely, 2^9907621973 is an apocalyptic number.

It is an amenable number.

9907621973 is a deficient number, since it is larger than the sum of its proper divisors (341642167).

9907621973 is a wasteful number, since it uses less digits than its factorization.

9907621973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341642166.

The product of its (nonzero) digits is 1285956, while the sum is 53.

The square root of 9907621973 is about 99537.0381968441. The cubic root of 9907621973 is about 2147.7800755669.

The spelling of 9907621973 in words is "nine billion, nine hundred seven million, six hundred twenty-one thousand, nine hundred seventy-three".