40398028 has 72 divisors (see below), whose sum is σ = 85800960. Its totient is φ = 16552800.

The previous prime is 40398023. The next prime is 40398041. The reversal of 40398028 is 82089304.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 40397984 and 40398002.

It is not an unprimeable number, because it can be changed into a prime (40398023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211413 + ... + 211603.

It is an arithmetic number, because the mean of its divisors is an integer number (1191680).

Almost surely, 2^40398028 is an apocalyptic number.

It is an amenable number.

40398028 is an abundant number, since it is smaller than the sum of its proper divisors (45402932).

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

40398028 is a wasteful number, since it uses less digits than its factorization.

40398028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 40398028 is about 6355.9443043501. The cubic root of 40398028 is about 343.1258112706.

The spelling of 40398028 in words is "forty million, three hundred ninety-eight thousand, twenty-eight".