400666733 has 4 divisors (see below), whose sum is σ = 409984608. Its totient is φ = 391348860.

The previous prime is 400666729. The next prime is 400666753. The reversal of 400666733 is 337666004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400666733 - 2² = 400666729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400666693 and 400666702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400666753) 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, 4658873 + ... + 4658958.

It is an arithmetic number, because the mean of its divisors is an integer number (102496152).

Almost surely, 2^400666733 is an apocalyptic number.

400666733 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

It is an amenable number.

400666733 is a deficient number, since it is larger than the sum of its proper divisors (9317875).

400666733 is an equidigital number, since it uses as much as digits as its factorization.

400666733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9317874.

The product of its (nonzero) digits is 54432, while the sum is 35.

The square root of 400666733 is about 20016.6613849563. The cubic root of 400666733 is about 737.2154500461.

The spelling of 400666733 in words is "four hundred million, six hundred sixty-six thousand, seven hundred thirty-three".