420155999 has 4 divisors (see below), whose sum is σ = 420223800. Its totient is φ = 420088200.

The previous prime is 420155993. The next prime is 420156001. The reversal of 420155999 is 999551024.

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

It is a cyclic number.

It is not a de Polignac number, because 420155999 - 2²⁴ = 403378783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420155993) 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, 23552 + ... + 37349.

It is an arithmetic number, because the mean of its divisors is an integer number (105055950).

Almost surely, 2^420155999 is an apocalyptic number.

420155999 is a deficient number, since it is larger than the sum of its proper divisors (67801).

420155999 is an equidigital number, since it uses as much as digits as its factorization.

420155999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67800.

The product of its (nonzero) digits is 145800, while the sum is 44.

The square root of 420155999 is about 20497.7071644611. The cubic root of 420155999 is about 748.9799460229.

The spelling of 420155999 in words is "four hundred twenty million, one hundred fifty-five thousand, nine hundred ninety-nine".