420291188 has 6 divisors (see below), whose sum is σ = 735509586. Its totient is φ = 210145592.

The previous prime is 420291173. The next prime is 420291241. The reversal of 420291188 is 881192024.

It can be written as a sum of positive squares in only one way, i.e., 251603044 + 168688144 = 15862^2 + 12988^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52536395 + ... + 52536402.

It is an arithmetic number, because the mean of its divisors is an integer number (122584931).

Almost surely, 2^420291188 is an apocalyptic number.

It is an amenable number.

420291188 is a deficient number, since it is larger than the sum of its proper divisors (315218398).

420291188 is a wasteful number, since it uses less digits than its factorization.

420291188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105072801 (or 105072799 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 420291188 is about 20501.0045607526. The cubic root of 420291188 is about 749.0602677703.

The spelling of 420291188 in words is "four hundred twenty million, two hundred ninety-one thousand, one hundred eighty-eight".