40370640 has 40 divisors (see below), whose sum is σ = 125149728. Its totient is φ = 10765440.

The previous prime is 40370591. The next prime is 40370641. The reversal of 40370640 is 4607304.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 40370640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40370641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83866 + ... + 84345.

Almost surely, 2^40370640 is an apocalyptic number.

40370640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40370640 is an abundant number, since it is smaller than the sum of its proper divisors (84779088).

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

40370640 is a wasteful number, since it uses less digits than its factorization.

40370640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168227 (or 168221 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 40370640 is about 6353.7894204955. The cubic root of 40370640 is about 343.0482525820.

Adding to 40370640 its reverse (4607304), we get a palindrome (44977944).

The spelling of 40370640 in words is "forty million, three hundred seventy thousand, six hundred forty".