420765511 has 4 divisors (see below), whose sum is σ = 434338624. Its totient is φ = 407192400.

The previous prime is 420765491. The next prime is 420765539. The reversal of 420765511 is 115567024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420765511 - 2¹³ = 420757319 is a prime.

It is a super-2 number, since 2×420765511² = 354087230494182242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 13573081 = 420765511 / (4 + 2 + 0 + 7 + 6 + 5 + 5 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420765571) 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, 6786510 + ... + 6786571.

It is an arithmetic number, because the mean of its divisors is an integer number (108584656).

Almost surely, 2^420765511 is an apocalyptic number.

420765511 is the 9174-th centered decagonal number.

420765511 is a deficient number, since it is larger than the sum of its proper divisors (13573113).

420765511 is a wasteful number, since it uses less digits than its factorization.

420765511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13573112.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 420765511 is about 20512.5695855005. The cubic root of 420765511 is about 749.3419478290.

The spelling of 420765511 in words is "four hundred twenty million, seven hundred sixty-five thousand, five hundred eleven".