40121413 has 4 divisors (see below), whose sum is σ = 41504940. Its totient is φ = 38737888.

The previous prime is 40121399. The next prime is 40121423. The reversal of 40121413 is 31412104.

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 15499969 + 24621444 = 3937^2 + 4962^2 .

It is a cyclic number.

It is not a de Polignac number, because 40121413 - 2⁵ = 40121381 is a prime.

It is a super-2 number, since 2×40121413² = 3219455562233138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121423) 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, 691720 + ... + 691777.

It is an arithmetic number, because the mean of its divisors is an integer number (10376235).

Almost surely, 2^40121413 is an apocalyptic number.

It is an amenable number.

40121413 is a deficient number, since it is larger than the sum of its proper divisors (1383527).

40121413 is a wasteful number, since it uses less digits than its factorization.

40121413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383526.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 40121413 is about 6334.1465881364. The cubic root of 40121413 is about 342.3408620106.

Adding to 40121413 its reverse (31412104), we get a palindrome (71533517).

The spelling of 40121413 in words is "forty million, one hundred twenty-one thousand, four hundred thirteen".