72239389 has 4 divisors (see below), whose sum is σ = 75380256. Its totient is φ = 69098524.

The previous prime is 72239381. The next prime is 72239411. The reversal of 72239389 is 98393227.

It is a happy number.

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: 98393227 = 167 ⋅589181.

It is a cyclic number.

It is not a de Polignac number, because 72239389 - 2³ = 72239381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72239381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1570399 + ... + 1570444.

It is an arithmetic number, because the mean of its divisors is an integer number (18845064).

Almost surely, 2^72239389 is an apocalyptic number.

It is an amenable number.

72239389 is a deficient number, since it is larger than the sum of its proper divisors (3140867).

72239389 is a wasteful number, since it uses less digits than its factorization.

72239389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140866.

The product of its digits is 163296, while the sum is 43.

The square root of 72239389 is about 8499.3758006103. The cubic root of 72239389 is about 416.4773186244.

The spelling of 72239389 in words is "seventy-two million, two hundred thirty-nine thousand, three hundred eighty-nine".