697221390 has 32 divisors (see below), whose sum is σ = 1674133920. Its totient is φ = 185836544.

The previous prime is 697221367. The next prime is 697221407. The reversal of 697221390 is 93122796.

It is a super-2 number, since 2×697221390² = 972235333347064200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79126 + ... + 87494.

It is an arithmetic number, because the mean of its divisors is an integer number (52316685).

Almost surely, 2^697221390 is an apocalyptic number.

697221390 is an abundant number, since it is smaller than the sum of its proper divisors (976912530).

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

697221390 is a wasteful number, since it uses less digits than its factorization.

697221390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11156.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 697221390 is about 26404.9501040998. The cubic root of 697221390 is about 886.7276157687.

The spelling of 697221390 in words is "six hundred ninety-seven million, two hundred twenty-one thousand, three hundred ninety".