7972401509 has 4 divisors (see below), whose sum is σ = 7984074816. Its totient is φ = 7960728204.

The previous prime is 7972401469. The next prime is 7972401551. The reversal of 7972401509 is 9051042797.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9051042797 = 67 ⋅135090191.

It is a cyclic number.

It is not a de Polignac number, because 7972401509 - 2⁸ = 7972401253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7972401509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7972401559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5835629 + ... + 5836994.

It is an arithmetic number, because the mean of its divisors is an integer number (1996018704).

Almost surely, 2^7972401509 is an apocalyptic number.

It is an amenable number.

7972401509 is a deficient number, since it is larger than the sum of its proper divisors (11673307).

7972401509 is a wasteful number, since it uses less digits than its factorization.

7972401509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11673306.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 7972401509 is about 89288.3055556549. The cubic root of 7972401509 is about 1997.6974759588.

The spelling of 7972401509 in words is "seven billion, nine hundred seventy-two million, four hundred one thousand, five hundred nine".