420431555 has 8 divisors (see below), whose sum is σ = 518153712. Its totient is φ = 327254688.

The previous prime is 420431527. The next prime is 420431587. The reversal of 420431555 is 555134024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420431555 - 2¹⁰ = 420430531 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1136117 + ... + 1136486.

It is an arithmetic number, because the mean of its divisors is an integer number (64769214).

Almost surely, 2^420431555 is an apocalyptic number.

420431555 is a deficient number, since it is larger than the sum of its proper divisors (97722157).

420431555 is a wasteful number, since it uses less digits than its factorization.

420431555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272645.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 420431555 is about 20504.4276925741. The cubic root of 420431555 is about 749.1436477718.

Adding to 420431555 its reverse (555134024), we get a palindrome (975565579).

The spelling of 420431555 in words is "four hundred twenty million, four hundred thirty-one thousand, five hundred fifty-five".