420742136 has 8 divisors (see below), whose sum is σ = 788891520. Its totient is φ = 210371064.

The previous prime is 420742109. The next prime is 420742139. The reversal of 420742136 is 631247024.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 420742099 and 420742108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420742139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26296376 + ... + 26296391.

It is an arithmetic number, because the mean of its divisors is an integer number (98611440).

Almost surely, 2^420742136 is an apocalyptic number.

It is an amenable number.

420742136 is a deficient number, since it is larger than the sum of its proper divisors (368149384).

420742136 is a wasteful number, since it uses less digits than its factorization.

420742136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52592773 (or 52592769 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 420742136 is about 20511.9998049922. Note that the first 3 decimals coincide. The cubic root of 420742136 is about 749.3280713809.

The spelling of 420742136 in words is "four hundred twenty million, seven hundred forty-two thousand, one hundred thirty-six".