309711421 has 8 divisors (see below), whose sum is σ = 322809344. Its totient is φ = 296807760.

The previous prime is 309711403. The next prime is 309711463. The reversal of 309711421 is 124117903.

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 309711421 - 2²⁷ = 175493693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 309711421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309711121) 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, 45306 + ... + 51691.

It is an arithmetic number, because the mean of its divisors is an integer number (40351168).

Almost surely, 2^309711421 is an apocalyptic number.

309711421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

309711421 is a deficient number, since it is larger than the sum of its proper divisors (13097923).

309711421 is a wasteful number, since it uses less digits than its factorization.

309711421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97131.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 309711421 is about 17598.6198606595. The cubic root of 309711421 is about 676.5798720915.

The spelling of 309711421 in words is "three hundred nine million, seven hundred eleven thousand, four hundred twenty-one".