40121901 has 36 divisors (see below), whose sum is σ = 62586108. Its totient is φ = 24755328.

The previous prime is 40121869. The next prime is 40121909. The reversal of 40121901 is 10912104.

It can be written as a sum of positive squares in 2 ways, for example, as 18275625 + 21846276 = 4275^2 + 4674^2 .

It is not a de Polignac number, because 40121901 - 2⁵ = 40121869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121909) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 172081 + ... + 172313.

It is an arithmetic number, because the mean of its divisors is an integer number (1738503).

Almost surely, 2^40121901 is an apocalyptic number.

It is an amenable number.

40121901 is a deficient number, since it is larger than the sum of its proper divisors (22464207).

40121901 is a wasteful number, since it uses less digits than its factorization.

40121901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 40121901 is about 6334.1851093886. The cubic root of 40121901 is about 342.3422499782.

The spelling of 40121901 in words is "forty million, one hundred twenty-one thousand, nine hundred one".