420816737 has 4 divisors (see below), whose sum is σ = 459072816. Its totient is φ = 382560660.

The previous prime is 420816727. The next prime is 420816757. The reversal of 420816737 is 737618024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420816737 - 2⁶ = 420816673 is a prime.

It is a super-2 number, since 2×420816737² = 354173452278654338, which contains 22 as substring.

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 420816737.

It is not an unprimeable number, because it can be changed into a prime (420816727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19128023 + ... + 19128044.

It is an arithmetic number, because the mean of its divisors is an integer number (114768204).

Almost surely, 2^420816737 is an apocalyptic number.

It is an amenable number.

420816737 is a deficient number, since it is larger than the sum of its proper divisors (38256079).

420816737 is a wasteful number, since it uses less digits than its factorization.

420816737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38256078.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 420816737 is about 20513.8181965230. The cubic root of 420816737 is about 749.3723560825.

The spelling of 420816737 in words is "four hundred twenty million, eight hundred sixteen thousand, seven hundred thirty-seven".