1400225621 has 4 divisors (see below), whose sum is σ = 1482591852. Its totient is φ = 1317859392.

The previous prime is 1400225609. The next prime is 1400225657. The reversal of 1400225621 is 1265220041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1265220041 = 23 ⋅55009567.

It can be written as a sum of positive squares in 2 ways, for example, as 1108157521 + 292068100 = 33289^2 + 17090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400225621 - 2²² = 1396031317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400225221) 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, 41183090 + ... + 41183123.

It is an arithmetic number, because the mean of its divisors is an integer number (370647963).

Almost surely, 2^1400225621 is an apocalyptic number.

It is an amenable number.

1400225621 is a deficient number, since it is larger than the sum of its proper divisors (82366231).

1400225621 is an equidigital number, since it uses as much as digits as its factorization.

1400225621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82366230.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1400225621 is about 37419.5887337100. The cubic root of 1400225621 is about 1118.7490340243.

Adding to 1400225621 its reverse (1265220041), we get a palindrome (2665445662).

The spelling of 1400225621 in words is "one billion, four hundred million, two hundred twenty-five thousand, six hundred twenty-one".