72401405 has 4 divisors (see below), whose sum is σ = 86881692. Its totient is φ = 57921120.

The previous prime is 72401389. The next prime is 72401431. The reversal of 72401405 is 50410427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13388281 + 59013124 = 3659^2 + 7682^2 .

It is not a de Polignac number, because 72401405 - 2⁴ = 72401389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7240136 + ... + 7240145.

It is an arithmetic number, because the mean of its divisors is an integer number (21720423).

Almost surely, 2^72401405 is an apocalyptic number.

It is an amenable number.

72401405 is a deficient number, since it is larger than the sum of its proper divisors (14480287).

72401405 is a wasteful number, since it uses less digits than its factorization.

72401405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14480286.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 72401405 is about 8508.9015154719. The cubic root of 72401405 is about 416.7884397854.

The spelling of 72401405 in words is "seventy-two million, four hundred one thousand, four hundred five".