722021953 has 4 divisors (see below), whose sum is σ = 722521008. Its totient is φ = 721522900.

The previous prime is 722021939. The next prime is 722021981. The reversal of 722021953 is 359120227.

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, and also an emirpimes, since its reverse is a distinct semiprime: 359120227 = 3449 ⋅104123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722021953 is a prime.

It is a super-2 number, since 2×722021953² = 1042631401227868418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722021353) 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, 247351 + ... + 250252.

It is an arithmetic number, because the mean of its divisors is an integer number (180630252).

Almost surely, 2^722021953 is an apocalyptic number.

It is an amenable number.

722021953 is a deficient number, since it is larger than the sum of its proper divisors (499055).

722021953 is a wasteful number, since it uses less digits than its factorization.

722021953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499054.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 722021953 is about 26870.4661850144. The cubic root of 722021953 is about 897.1191642093.

The spelling of 722021953 in words is "seven hundred twenty-two million, twenty-one thousand, nine hundred fifty-three".