420261634 has 32 divisors (see below), whose sum is σ = 687448944. Its totient is φ = 191539200.

The previous prime is 420261631. The next prime is 420261683. The reversal of 420261634 is 436162024.

It can be written as a sum of positive squares in 8 ways, for example, as 302864409 + 117397225 = 17403^2 + 10835^2 .

It is not an unprimeable number, because it can be changed into a prime (420261631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1047834 + ... + 1048234.

Almost surely, 2^420261634 is an apocalyptic number.

420261634 is a deficient number, since it is larger than the sum of its proper divisors (267187310).

420261634 is a wasteful number, since it uses less digits than its factorization.

420261634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 420261634 is about 20500.2837541337. The cubic root of 420261634 is about 749.0427099067.

It can be divided in two parts, 42026 and 1634, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 420261634 in words is "four hundred twenty million, two hundred sixty-one thousand, six hundred thirty-four".