420400051 has 4 divisors (see below), whose sum is σ = 420442704. Its totient is φ = 420357400.

The previous prime is 420399997. The next prime is 420400067. The reversal of 420400051 is 150004024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 420400051 - 2⁷ = 420399923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420399998 and 420400034.

It is not an unprimeable number, because it can be changed into a prime (420400451) 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, 1866 + ... + 29056.

It is an arithmetic number, because the mean of its divisors is an integer number (105110676).

Almost surely, 2^420400051 is an apocalyptic number.

420400051 is a deficient number, since it is larger than the sum of its proper divisors (42653).

420400051 is a wasteful number, since it uses less digits than its factorization.

420400051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42652.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 420400051 is about 20503.6594538634. The cubic root of 420400051 is about 749.1249355615.

Adding to 420400051 its reverse (150004024), we get a palindrome (570404075).

The spelling of 420400051 in words is "four hundred twenty million, four hundred thousand, fifty-one".