400272730621 has 2 divisors, whose sum is σ = 400272730622. Its totient is φ = 400272730620.

The previous prime is 400272730609. The next prime is 400272730657. The reversal of 400272730621 is 126037272004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325846888900 + 74425841721 = 570830^2 + 272811^2 .

It is a cyclic number.

It is not a de Polignac number, because 400272730621 - 2²⁵ = 400239176189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400272730421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200136365310 + 200136365311.

It is an arithmetic number, because the mean of its divisors is an integer number (200136365311).

Almost surely, 2^400272730621 is an apocalyptic number.

It is an amenable number.

400272730621 is a deficient number, since it is larger than the sum of its proper divisors (1).

400272730621 is an equidigital number, since it uses as much as digits as its factorization.

400272730621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 34.

The spelling of 400272730621 in words is "four hundred billion, two hundred seventy-two million, seven hundred thirty thousand, six hundred twenty-one".