40121997 has 4 divisors (see below), whose sum is σ = 53496000. Its totient is φ = 26747996.

The previous prime is 40121981. The next prime is 40121999. The reversal of 40121997 is 79912104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40121997 - 2⁴ = 40121981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121999) 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, 6686997 + ... + 6687002.

It is an arithmetic number, because the mean of its divisors is an integer number (13374000).

Almost surely, 2^40121997 is an apocalyptic number.

It is an amenable number.

40121997 is a deficient number, since it is larger than the sum of its proper divisors (13374003).

40121997 is a wasteful number, since it uses less digits than its factorization.

40121997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13374002.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 40121997 is about 6334.1926873123. The cubic root of 40121997 is about 342.3425230197.

The spelling of 40121997 in words is "forty million, one hundred twenty-one thousand, nine hundred ninety-seven".