40720157 has 2 divisors, whose sum is σ = 40720158. Its totient is φ = 40720156.

The previous prime is 40720153. The next prime is 40720181. The reversal of 40720157 is 75102704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38204761 + 2515396 = 6181^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 40720157 - 2² = 40720153 is a prime.

It is a super-2 number, since 2×40720157² = 3316262372209298, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40720153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20360078 + 20360079.

It is an arithmetic number, because the mean of its divisors is an integer number (20360079).

Almost surely, 2^40720157 is an apocalyptic number.

It is an amenable number.

40720157 is a deficient number, since it is larger than the sum of its proper divisors (1).

40720157 is an equidigital number, since it uses as much as digits as its factorization.

40720157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 40720157 is about 6381.2347551238. The cubic root of 40720157 is about 344.0354124577.

The spelling of 40720157 in words is "forty million, seven hundred twenty thousand, one hundred fifty-seven".