721900434 has 8 divisors (see below), whose sum is σ = 1443800880. Its totient is φ = 240633476.

The previous prime is 721900423. The next prime is 721900447. The reversal of 721900434 is 434009127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

721900434 is an admirable number.

It is a super-2 number, since 2×721900434² = 1042280473218776712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60158364 + ... + 60158375.

It is an arithmetic number, because the mean of its divisors is an integer number (180475110).

Almost surely, 2^721900434 is an apocalyptic number.

721900434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721900434 is a wasteful number, since it uses less digits than its factorization.

721900434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120316744.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 721900434 is about 26868.2048897949. The cubic root of 721900434 is about 897.0688318799.

The spelling of 721900434 in words is "seven hundred twenty-one million, nine hundred thousand, four hundred thirty-four".