139224730 has 16 divisors (see below), whose sum is σ = 265346280. Its totient is φ = 52413952.

The previous prime is 139224721. The next prime is 139224731. The reversal of 139224730 is 37422931.

It can be written as a sum of positive squares in 4 ways, for example, as 114254721 + 24970009 = 10689^2 + 4997^2 .

It is a junction number, because it is equal to n+sod(n) for n = 139224692 and 139224701.

It is not an unprimeable number, because it can be changed into a prime (139224731) 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, 409315 + ... + 409654.

Almost surely, 2^139224730 is an apocalyptic number.

139224730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139224730 is a deficient number, since it is larger than the sum of its proper divisors (126121550).

139224730 is a wasteful number, since it uses less digits than its factorization.

139224730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818993.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 139224730 is about 11799.3529483612. The cubic root of 139224730 is about 518.2891628999.

The spelling of 139224730 in words is "one hundred thirty-nine million, two hundred twenty-four thousand, seven hundred thirty".