406242121445 has 4 divisors (see below), whose sum is σ = 487490545740. Its totient is φ = 324993697152.

The previous prime is 406242121429. The next prime is 406242121457. The reversal of 406242121445 is 544121242604.

It is a happy number.

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 221232885316 + 185009236129 = 470354^2 + 430127^2 .

It is a cyclic number.

It is not a de Polignac number, because 406242121445 - 2⁴ = 406242121429 is a prime.

It is a super-2 number, since 2×406242121445² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40624212140 + ... + 40624212149.

It is an arithmetic number, because the mean of its divisors is an integer number (121872636435).

Almost surely, 2^406242121445 is an apocalyptic number.

It is an amenable number.

406242121445 is a deficient number, since it is larger than the sum of its proper divisors (81248424295).

406242121445 is an equidigital number, since it uses as much as digits as its factorization.

406242121445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81248424294.

The product of its (nonzero) digits is 61440, while the sum is 35.

The spelling of 406242121445 in words is "four hundred six billion, two hundred forty-two million, one hundred twenty-one thousand, four hundred forty-five".