72443831 has 2 divisors, whose sum is σ = 72443832. Its totient is φ = 72443830.

The previous prime is 72443809. The next prime is 72443837. The reversal of 72443831 is 13834427.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72443831 - 2¹⁴ = 72427447 is a prime.

It is a super-2 number, since 2×72443831² = 10496217299913122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72443837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36221915 + 36221916.

It is an arithmetic number, because the mean of its divisors is an integer number (36221916).

Almost surely, 2^72443831 is an apocalyptic number.

72443831 is a deficient number, since it is larger than the sum of its proper divisors (1).

72443831 is an equidigital number, since it uses as much as digits as its factorization.

72443831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 32.

The square root of 72443831 is about 8511.3941866183. The cubic root of 72443831 is about 416.8698342167.

The spelling of 72443831 in words is "seventy-two million, four hundred forty-three thousand, eight hundred thirty-one".