40287940 has 48 divisors (see below), whose sum is σ = 105485184. Its totient is φ = 12556800.

The previous prime is 40287889. The next prime is 40287979. The reversal of 40287940 is 4978204.

It is a happy number.

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 = 40287896 and 40287905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11541 + ... + 14620.

It is an arithmetic number, because the mean of its divisors is an integer number (2197608).

Almost surely, 2^40287940 is an apocalyptic number.

It is an amenable number.

40287940 is an abundant number, since it is smaller than the sum of its proper divisors (65197244).

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

40287940 is a wasteful number, since it uses less digits than its factorization.

40287940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26188 (or 26186 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 40287940 is about 6347.2781568165. The cubic root of 40287940 is about 342.8138455576.

It can be divided in two parts, 40 and 287940, that multiplied together give a triangular number (11517600 = T₄₇₉₉).

The spelling of 40287940 in words is "forty million, two hundred eighty-seven thousand, nine hundred forty".