420101172 has 36 divisors (see below), whose sum is σ = 1117814880. Its totient is φ = 132663312.

The previous prime is 420101159. The next prime is 420101197. The reversal of 420101172 is 271101024.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306408 + ... + 307775.

Almost surely, 2^420101172 is an apocalyptic number.

It is an amenable number.

420101172 is an abundant number, since it is smaller than the sum of its proper divisors (697713708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420101172 is a wasteful number, since it uses less digits than its factorization.

420101172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614212 (or 614207 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 420101172 is about 20496.3697273444. The cubic root of 420101172 is about 748.9473659733.

Adding to 420101172 its reverse (271101024), we get a palindrome (691202196).

The spelling of 420101172 in words is "four hundred twenty million, one hundred one thousand, one hundred seventy-two".