72429386 has 4 divisors (see below), whose sum is σ = 108644082. Its totient is φ = 36214692.

The previous prime is 72429373. The next prime is 72429389. The reversal of 72429386 is 68392427.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 37442161 + 34987225 = 6119^2 + 5915^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72429389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18107345 + ... + 18107348.

Almost surely, 2^72429386 is an apocalyptic number.

72429386 is a deficient number, since it is larger than the sum of its proper divisors (36214696).

72429386 is a wasteful number, since it uses less digits than its factorization.

72429386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36214695.

The product of its digits is 145152, while the sum is 41.

The square root of 72429386 is about 8510.5455759311. The cubic root of 72429386 is about 416.8421250019.

The spelling of 72429386 in words is "seventy-two million, four hundred twenty-nine thousand, three hundred eighty-six".