40408428 has 12 divisors (see below), whose sum is σ = 94286360. Its totient is φ = 13469472.

The previous prime is 40408427. The next prime is 40408429. The reversal of 40408428 is 82480404.

It is an interprime number because it is at equal distance from previous prime (40408427) and next prime (40408429).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 40408395 and 40408404.

It is not an unprimeable number, because it can be changed into a prime (40408427) 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, 1683673 + ... + 1683696.

Almost surely, 2^40408428 is an apocalyptic number.

It is an amenable number.

40408428 is an abundant number, since it is smaller than the sum of its proper divisors (53877932).

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

40408428 is a wasteful number, since it uses less digits than its factorization.

40408428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3367376 (or 3367374 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 40408428 is about 6356.7623834779. The cubic root of 40408428 is about 343.1552533204.

The spelling of 40408428 in words is "forty million, four hundred eight thousand, four hundred twenty-eight".