40247428 has 12 divisors (see below), whose sum is σ = 75851020. Its totient is φ = 18575712.

The previous prime is 40247423. The next prime is 40247429. The reversal of 40247428 is 82474204.

It can be written as a sum of positive squares in 2 ways, for example, as 16257024 + 23990404 = 4032^2 + 4898^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40247428.

It is not an unprimeable number, because it can be changed into a prime (40247423) 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, 386943 + ... + 387046.

Almost surely, 2^40247428 is an apocalyptic number.

It is an amenable number.

40247428 is a deficient number, since it is larger than the sum of its proper divisors (35603592).

40247428 is a wasteful number, since it uses less digits than its factorization.

40247428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774006 (or 774004 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 40247428 is about 6344.0860649900. The cubic root of 40247428 is about 342.6989002231.

The spelling of 40247428 in words is "forty million, two hundred forty-seven thousand, four hundred twenty-eight".