721406146 has 32 divisors (see below), whose sum is σ = 1159188480. Its totient is φ = 335966400.

The previous prime is 721406137. The next prime is 721406167. The reversal of 721406146 is 641604127.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1091056 + ... + 1091716.

It is an arithmetic number, because the mean of its divisors is an integer number (36224640).

Almost surely, 2^721406146 is an apocalyptic number.

721406146 is a deficient number, since it is larger than the sum of its proper divisors (437782334).

721406146 is a wasteful number, since it uses less digits than its factorization.

721406146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 721406146 is about 26859.0049331691. The cubic root of 721406146 is about 896.8640429746.

The spelling of 721406146 in words is "seven hundred twenty-one million, four hundred six thousand, one hundred forty-six".