40148728 has 8 divisors (see below), whose sum is σ = 75278880. Its totient is φ = 20074360.

The previous prime is 40148711. The next prime is 40148743. The reversal of 40148728 is 82784104.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×40148728² = 3223840720035968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40148693 and 40148702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2509288 + ... + 2509303.

It is an arithmetic number, because the mean of its divisors is an integer number (9409860).

Almost surely, 2^40148728 is an apocalyptic number.

It is an amenable number.

40148728 is a deficient number, since it is larger than the sum of its proper divisors (35130152).

40148728 is a wasteful number, since it uses less digits than its factorization.

40148728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018597 (or 5018593 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 40148728 is about 6336.3023917739. The cubic root of 40148728 is about 342.4185339125.

The spelling of 40148728 in words is "forty million, one hundred forty-eight thousand, seven hundred twenty-eight".