40388340 has 48 divisors (see below), whose sum is σ = 113742720. Its totient is φ = 10707840.

The previous prime is 40388339. The next prime is 40388389. The reversal of 40388340 is 4388304.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 40388298 and 40388307.

It is a congruent number.

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, 9001 + ... + 12719.

It is an arithmetic number, because the mean of its divisors is an integer number (2369640).

Almost surely, 2^40388340 is an apocalyptic number.

It is an amenable number.

40388340 is an abundant number, since it is smaller than the sum of its proper divisors (73354380).

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

40388340 is a wasteful number, since it uses less digits than its factorization.

40388340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912 (or 3910 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 40388340 is about 6355.1821374371. The cubic root of 40388340 is about 343.0983803225.

The spelling of 40388340 in words is "forty million, three hundred eighty-eight thousand, three hundred forty".