1400697721 has 8 divisors (see below), whose sum is σ = 1415606400. Its totient is φ = 1385814432.

The previous prime is 1400697703. The next prime is 1400697737. The reversal of 1400697721 is 1277960041.

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

It is a cyclic number.

It is not a de Polignac number, because 1400697721 - 2¹⁵ = 1400664953 is a prime.

It is a super-3 number, since 3×1400697721³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1400697821) 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, 117180 + ... + 128578.

It is an arithmetic number, because the mean of its divisors is an integer number (176950800).

Almost surely, 2^1400697721 is an apocalyptic number.

It is an amenable number.

1400697721 is a deficient number, since it is larger than the sum of its proper divisors (14908679).

1400697721 is a wasteful number, since it uses less digits than its factorization.

1400697721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12695.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 1400697721 is about 37425.8963954105. The cubic root of 1400697721 is about 1118.8747523523.

The spelling of 1400697721 in words is "one billion, four hundred million, six hundred ninety-seven thousand, seven hundred twenty-one".