403155421 has 4 divisors (see below), whose sum is σ = 408678172. Its totient is φ = 397632672.

The previous prime is 403155413. The next prime is 403155427. The reversal of 403155421 is 124551304.

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 74132100 + 329023321 = 8610^2 + 18139^2 .

It is a cyclic number.

It is not a de Polignac number, because 403155421 - 2³ = 403155413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403155427) 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, 2761266 + ... + 2761411.

It is an arithmetic number, because the mean of its divisors is an integer number (102169543).

Almost surely, 2^403155421 is an apocalyptic number.

It is an amenable number.

403155421 is a deficient number, since it is larger than the sum of its proper divisors (5522751).

403155421 is an equidigital number, since it uses as much as digits as its factorization.

403155421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5522750.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 403155421 is about 20078.7305624634. The cubic root of 403155421 is about 738.7386724519.

The spelling of 403155421 in words is "four hundred three million, one hundred fifty-five thousand, four hundred twenty-one".