690405047 has 4 divisors (see below), whose sum is σ = 690545496. Its totient is φ = 690264600.

The previous prime is 690405041. The next prime is 690405073. The reversal of 690405047 is 740504096.

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

It is a cyclic number.

It is not a de Polignac number, because 690405047 - 2⁴ = 690405031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690404998 and 690405016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690405041) 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, 62573 + ... + 72774.

It is an arithmetic number, because the mean of its divisors is an integer number (172636374).

Almost surely, 2^690405047 is an apocalyptic number.

690405047 is a deficient number, since it is larger than the sum of its proper divisors (140449).

690405047 is a wasteful number, since it uses less digits than its factorization.

690405047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140448.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 690405047 is about 26275.5598798579. The cubic root of 690405047 is about 883.8284676187.

The spelling of 690405047 in words is "six hundred ninety million, four hundred five thousand, forty-seven".