721429366 has 16 divisors (see below), whose sum is σ = 1243018656. Its totient is φ = 307613376.

The previous prime is 721429363. The next prime is 721429369. The reversal of 721429366 is 663924127.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (721429363) and next prime (721429369).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721429363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128031 + ... + 133546.

It is an arithmetic number, because the mean of its divisors is an integer number (77688666).

Almost surely, 2^721429366 is an apocalyptic number.

721429366 is a deficient number, since it is larger than the sum of its proper divisors (521589290).

721429366 is a wasteful number, since it uses less digits than its factorization.

721429366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261783.

The product of its digits is 108864, while the sum is 40.

The square root of 721429366 is about 26859.4371869554. The cubic root of 721429366 is about 896.8736653673.

The spelling of 721429366 in words is "seven hundred twenty-one million, four hundred twenty-nine thousand, three hundred sixty-six".