40305737 has 4 divisors (see below), whose sum is σ = 41695620. Its totient is φ = 38915856.

The previous prime is 40305701. The next prime is 40305739. The reversal of 40305737 is 73750304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31685641 + 8620096 = 5629^2 + 2936^2 .

It is a cyclic number.

It is not a de Polignac number, because 40305737 - 2⁸ = 40305481 is a prime.

It is a super-2 number, since 2×40305737² = 3249104870226338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 1389853 = 40305737 / (4 + 0 + 3 + 0 + 5 + 7 + 3 + 7).

It is not an unprimeable number, because it can be changed into a prime (40305739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694898 + ... + 694955.

It is an arithmetic number, because the mean of its divisors is an integer number (10423905).

Almost surely, 2^40305737 is an apocalyptic number.

It is an amenable number.

40305737 is a deficient number, since it is larger than the sum of its proper divisors (1389883).

40305737 is a wasteful number, since it uses less digits than its factorization.

40305737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389882.

The product of its (nonzero) digits is 8820, while the sum is 29.

The square root of 40305737 is about 6348.6799415312. The cubic root of 40305737 is about 342.8643169051.

The spelling of 40305737 in words is "forty million, three hundred five thousand, seven hundred thirty-seven".