420952391 has 8 divisors (see below), whose sum is σ = 445764480. Its totient is φ = 396406008.

The previous prime is 420952381. The next prime is 420952403. The reversal of 420952391 is 193259024.

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 420952391 - 2¹⁰ = 420951367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420952321) 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, 63161 + ... + 69506.

It is an arithmetic number, because the mean of its divisors is an integer number (55720560).

Almost surely, 2^420952391 is an apocalyptic number.

420952391 is a deficient number, since it is larger than the sum of its proper divisors (24812089).

420952391 is a wasteful number, since it uses less digits than its factorization.

420952391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132853.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 420952391 is about 20517.1243355398. The cubic root of 420952391 is about 749.4528697024.

The spelling of 420952391 in words is "four hundred twenty million, nine hundred fifty-two thousand, three hundred ninety-one".