420400426 has 4 divisors (see below), whose sum is σ = 630600642. Its totient is φ = 210200212.

The previous prime is 420400397. The next prime is 420400427. The reversal of 420400426 is 624004024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 273869401 + 146531025 = 16549^2 + 12105^2 .

It is a junction number, because it is equal to n+sod(n) for n = 420400397 and 420400406.

It is not an unprimeable number, because it can be changed into a prime (420400427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105100105 + ... + 105100108.

Almost surely, 2^420400426 is an apocalyptic number.

420400426 is a deficient number, since it is larger than the sum of its proper divisors (210200216).

420400426 is a wasteful number, since it uses less digits than its factorization.

420400426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210200215.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 420400426 is about 20503.6685985704. The cubic root of 420400426 is about 749.1251583032.

The spelling of 420400426 in words is "four hundred twenty million, four hundred thousand, four hundred twenty-six".