72391869 has 24 divisors (see below), whose sum is σ = 117160992. Its totient is φ = 42685920.

The previous prime is 72391867. The next prime is 72391871. The reversal of 72391869 is 96819327.

It is an interprime number because it is at equal distance from previous prime (72391867) and next prime (72391871).

It is not a de Polignac number, because 72391869 - 2¹ = 72391867 is a prime.

It is a super-2 number, since 2×72391869² = 10481165394626322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72391861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6219 + ... + 13544.

It is an arithmetic number, because the mean of its divisors is an integer number (4881708).

Almost surely, 2^72391869 is an apocalyptic number.

It is an amenable number.

72391869 is a deficient number, since it is larger than the sum of its proper divisors (44769123).

72391869 is a wasteful number, since it uses less digits than its factorization.

72391869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19817 (or 19814 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 72391869 is about 8508.3411426670. The cubic root of 72391869 is about 416.7701405592.

The spelling of 72391869 in words is "seventy-two million, three hundred ninety-one thousand, eight hundred sixty-nine".