40137730 has 16 divisors (see below), whose sum is σ = 72668664. Its totient is φ = 15961600.

The previous prime is 40137683. The next prime is 40137739. The reversal of 40137730 is 3773104.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 40081561 + 56169 = 6331^2 + 237^2 .

It is a super-2 number, since 2×40137730² = 3222074739105800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40137695 and 40137704.

It is not an unprimeable number, because it can be changed into a prime (40137739) 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, 9871 + ... + 13330.

Almost surely, 2^40137730 is an apocalyptic number.

40137730 is a deficient number, since it is larger than the sum of its proper divisors (32530934).

40137730 is a wasteful number, since it uses less digits than its factorization.

40137730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23381.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 40137730 is about 6335.4344760245. The cubic root of 40137730 is about 342.3872646532.

The spelling of 40137730 in words is "forty million, one hundred thirty-seven thousand, seven hundred thirty".