72042391 has 8 divisors (see below), whose sum is σ = 73684800. Its totient is φ = 70418400.

The previous prime is 72042389. The next prime is 72042407. The reversal of 72042391 is 19324027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72042391 - 2¹ = 72042389 is a prime.

It is a super-2 number, since 2×72042391² = 10380212201993762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72042301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3465 + ... + 12493.

It is an arithmetic number, because the mean of its divisors is an integer number (9210600).

Almost surely, 2^72042391 is an apocalyptic number.

72042391 is a deficient number, since it is larger than the sum of its proper divisors (1642409).

72042391 is a wasteful number, since it uses less digits than its factorization.

72042391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9209.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 72042391 is about 8487.7789203065. The cubic root of 72042391 is about 416.0983938084.

The spelling of 72042391 in words is "seventy-two million, forty-two thousand, three hundred ninety-one".