40070381 has 16 divisors (see below), whose sum is σ = 44452800. Its totient is φ = 35891328.

The previous prime is 40070369. The next prime is 40070389. The reversal of 40070381 is 18307004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40070381 - 2²² = 35876077 is a prime.

It is a super-2 number, since 2×40070381² = 3211270866970322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40070389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67970 + ... + 68556.

It is an arithmetic number, because the mean of its divisors is an integer number (2778300).

Almost surely, 2^40070381 is an apocalyptic number.

It is an amenable number.

40070381 is a deficient number, since it is larger than the sum of its proper divisors (4382419).

40070381 is a wasteful number, since it uses less digits than its factorization.

40070381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 40070381 is about 6330.1169815415. The cubic root of 40070381 is about 342.1956548351.

Adding to 40070381 its reverse (18307004), we get a palindrome (58377385).

The spelling of 40070381 in words is "forty million, seventy thousand, three hundred eighty-one".