309249742 has 8 divisors (see below), whose sum is σ = 464709096. Its totient is φ = 154346712.

The previous prime is 309249727. The next prime is 309249751. The reversal of 309249742 is 247942903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 309249695 and 309249704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137688 + ... + 139915.

It is an arithmetic number, because the mean of its divisors is an integer number (58088637).

Almost surely, 2^309249742 is an apocalyptic number.

309249742 is a deficient number, since it is larger than the sum of its proper divisors (155459354).

309249742 is a wasteful number, since it uses less digits than its factorization.

309249742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278162.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 309249742 is about 17585.4980594807. The cubic root of 309249742 is about 676.2435180571.

The spelling of 309249742 in words is "three hundred nine million, two hundred forty-nine thousand, seven hundred forty-two".