406754957921 has 4 divisors (see below), whose sum is σ = 438043800852. Its totient is φ = 375466114992.

The previous prime is 406754957827. The next prime is 406754957951. The reversal of 406754957921 is 129759457604.

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 120642296896 + 286112661025 = 347336^2 + 534895^2 .

It is a cyclic number.

It is not a de Polignac number, because 406754957921 - 2³⁰ = 405681216097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406754957951) 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, 15644421446 + ... + 15644421471.

It is an arithmetic number, because the mean of its divisors is an integer number (109510950213).

Almost surely, 2^406754957921 is an apocalyptic number.

It is an amenable number.

406754957921 is a deficient number, since it is larger than the sum of its proper divisors (31288842931).

406754957921 is a wasteful number, since it uses less digits than its factorization.

406754957921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31288842930.

The product of its (nonzero) digits is 19051200, while the sum is 59.

The spelling of 406754957921 in words is "four hundred six billion, seven hundred fifty-four million, nine hundred fifty-seven thousand, nine hundred twenty-one".