1420400777220 has 36 divisors (see below), whose sum is σ = 4308549024780. Its totient is φ = 378773540544.

The previous prime is 1420400777197. The next prime is 1420400777221. The reversal of 1420400777220 is 227770040241.

It is a happy number.

1420400777220 is a `hidden beast` number, since 1 + 4 + 20 + 400 + 7 + 7 + 7 + 220 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 882352120896 + 538048656324 = 939336^2 + 733518^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1420400777221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3945557535 + ... + 3945557894.

It is an arithmetic number, because the mean of its divisors is an integer number (119681917355).

Almost surely, 2^{1420400777220} is an apocalyptic number.

1420400777220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1420400777220 is an abundant number, since it is smaller than the sum of its proper divisors (2888148247560).

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

1420400777220 is a wasteful number, since it uses less digits than its factorization.

1420400777220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891115444 (or 7891115439 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 36.

The spelling of 1420400777220 in words is "one trillion, four hundred twenty billion, four hundred million, seven hundred seventy-seven thousand, two hundred twenty".