40221297 has 18 divisors (see below), whose sum is σ = 59504562. Its totient is φ = 26179776.

The previous prime is 40221263. The next prime is 40221301. The reversal of 40221297 is 79212204.

It can be written as a sum of positive squares in only one way, i.e., 39955041 + 266256 = 6321^2 + 516^2 .

It is not a de Polignac number, because 40221297 - 2⁷ = 40221169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40221297.

It is not an unprimeable number, because it can be changed into a prime (40226297) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15433 + ... + 17849.

It is an arithmetic number, because the mean of its divisors is an integer number (3305809).

Almost surely, 2^40221297 is an apocalyptic number.

It is an amenable number.

40221297 is a deficient number, since it is larger than the sum of its proper divisors (19283265).

40221297 is a wasteful number, since it uses less digits than its factorization.

40221297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509 (or 2463 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 40221297 is about 6342.0262534934. The cubic root of 40221297 is about 342.6247173982.

The spelling of 40221297 in words is "forty million, two hundred twenty-one thousand, two hundred ninety-seven".