40280312 has 8 divisors (see below), whose sum is σ = 75525600. Its totient is φ = 20140152.

The previous prime is 40280311. The next prime is 40280321. The reversal of 40280312 is 21308204.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40280311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2517512 + ... + 2517527.

It is an arithmetic number, because the mean of its divisors is an integer number (9440700).

Almost surely, 2^40280312 is an apocalyptic number.

It is an amenable number.

40280312 is a deficient number, since it is larger than the sum of its proper divisors (35245288).

40280312 is a wasteful number, since it uses less digits than its factorization.

40280312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035045 (or 5035041 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 40280312 is about 6346.6772408875. The cubic root of 40280312 is about 342.7922084038.

Adding to 40280312 its reverse (21308204), we get a palindrome (61588516).

It can be divided in two parts, 40 and 280312, that multiplied together give a triangular number (11212480 = T₄₇₃₅).

The spelling of 40280312 in words is "forty million, two hundred eighty thousand, three hundred twelve".