8420072 has 16 divisors (see below), whose sum is σ = 15819300. Its totient is φ = 4201600.

The previous prime is 8420051. The next prime is 8420119. The reversal of 8420072 is 2700248.

It can be written as a sum of positive squares in 2 ways, for example, as 8213956 + 206116 = 2866^2 + 454^2 .

It is a super-2 number, since 2×8420072² = 141795224970368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5822 + ... + 7122.

Almost surely, 2^8420072 is an apocalyptic number.

It is an amenable number.

8420072 is a deficient number, since it is larger than the sum of its proper divisors (7399228).

8420072 is a wasteful number, since it uses less digits than its factorization.

8420072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116 (or 2112 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 8420072 is about 2901.7360321022. The cubic root of 8420072 is about 203.4410561214.

The spelling of 8420072 in words is "eight million, four hundred twenty thousand, seventy-two".