146240639 has 4 divisors (see below), whose sum is σ = 146272056. Its totient is φ = 146209224.

The previous prime is 146240629. The next prime is 146240651. The reversal of 146240639 is 936042641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936042641 = 7537 ⋅124193.

It is a cyclic number.

It is not a de Polignac number, because 146240639 - 2⁴ = 146240623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 146240599 and 146240608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146240629) 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, 7184 + ... + 18549.

It is an arithmetic number, because the mean of its divisors is an integer number (36568014).

Almost surely, 2^146240639 is an apocalyptic number.

146240639 is a deficient number, since it is larger than the sum of its proper divisors (31417).

146240639 is an equidigital number, since it uses as much as digits as its factorization.

146240639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31416.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 146240639 is about 12092.9995865377. Note that the first 3 decimals coincide. The cubic root of 146240639 is about 526.8528803062.

The spelling of 146240639 in words is "one hundred forty-six million, two hundred forty thousand, six hundred thirty-nine".