420833387 has 4 divisors (see below), whose sum is σ = 453205200. Its totient is φ = 388461576.

The previous prime is 420833363. The next prime is 420833407. The reversal of 420833387 is 783338024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420833387 is a prime.

It is a super-2 number, since 2×420833387² = 354201479227783538, 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 420833387.

It is not an unprimeable number, because it can be changed into a prime (420836387) 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, 16185887 + ... + 16185912.

It is an arithmetic number, because the mean of its divisors is an integer number (113301300).

Almost surely, 2^420833387 is an apocalyptic number.

420833387 is a deficient number, since it is larger than the sum of its proper divisors (32371813).

420833387 is a wasteful number, since it uses less digits than its factorization.

420833387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32371812.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 420833387 is about 20514.2240165208. The cubic root of 420833387 is about 749.3822391536.

The spelling of 420833387 in words is "four hundred twenty million, eight hundred thirty-three thousand, three hundred eighty-seven".