172420739 has 8 divisors (see below), whose sum is σ = 174840000. Its totient is φ = 170007552.

The previous prime is 172420733. The next prime is 172420751. The reversal of 172420739 is 937024271.

172420739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 172420739 - 2¹⁶ = 172355203 is a prime.

It is a super-2 number, since 2×172420739² = 59457822474612242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172420699 and 172420708.

It is not an unprimeable number, because it can be changed into a prime (172420733) 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, 110537 + ... + 112085.

It is an arithmetic number, because the mean of its divisors is an integer number (21855000).

Almost surely, 2^172420739 is an apocalyptic number.

172420739 is a deficient number, since it is larger than the sum of its proper divisors (2419261).

172420739 is a wasteful number, since it uses less digits than its factorization.

172420739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3037.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 172420739 is about 13130.9077751692. The cubic root of 172420739 is about 556.5828676532.

The spelling of 172420739 in words is "one hundred seventy-two million, four hundred twenty thousand, seven hundred thirty-nine".