405551642 has 4 divisors (see below), whose sum is σ = 608327466. Its totient is φ = 202775820.

The previous prime is 405551639. The next prime is 405551681. The reversal of 405551642 is 246155504.

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., 260854801 + 144696841 = 16151^2 + 12029^2 .

It is a junction number, because it is equal to n+sod(n) for n = 405551599 and 405551608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101387909 + ... + 101387912.

Almost surely, 2^405551642 is an apocalyptic number.

405551642 is a deficient number, since it is larger than the sum of its proper divisors (202775824).

405551642 is a wasteful number, since it uses less digits than its factorization.

405551642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202775823.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 405551642 is about 20138.3127893078. The cubic root of 405551642 is about 740.1993874697.

The spelling of 405551642 in words is "four hundred five million, five hundred fifty-one thousand, six hundred forty-two".