1400445420 has 96 divisors (see below), whose sum is σ = 4299837696. Its totient is φ = 337747200.

The previous prime is 1400445391. The next prime is 1400445437. The reversal of 1400445420 is 245440041.

It is a happy number.

It is a super-2 number, since 2×1400445420² = 3922494748797952800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124635 + ... + 135405.

It is an arithmetic number, because the mean of its divisors is an integer number (44789976).

Almost surely, 2^1400445420 is an apocalyptic number.

1400445420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1400445420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2149918848).

1400445420 is an abundant number, since it is smaller than the sum of its proper divisors (2899392276).

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

1400445420 is a wasteful number, since it uses less digits than its factorization.

1400445420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10991 (or 10989 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 1400445420 is about 37422.5255695016. The cubic root of 1400445420 is about 1118.8075691275.

Adding to 1400445420 its reverse (245440041), we get a palindrome (1645885461).

The spelling of 1400445420 in words is "one billion, four hundred million, four hundred forty-five thousand, four hundred twenty".