400440077 has 2 divisors, whose sum is σ = 400440078. Its totient is φ = 400440076.

The previous prime is 400440043. The next prime is 400440107. The reversal of 400440077 is 770044004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397962601 + 2477476 = 19949^2 + 1574^2 .

It is a cyclic number.

It is not a de Polignac number, because 400440077 - 2⁶ = 400440013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400440277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200220038 + 200220039.

It is an arithmetic number, because the mean of its divisors is an integer number (200220039).

Almost surely, 2^400440077 is an apocalyptic number.

It is an amenable number.

400440077 is a deficient number, since it is larger than the sum of its proper divisors (1).

400440077 is an equidigital number, since it uses as much as digits as its factorization.

400440077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 400440077 is about 20010.9989006046. The cubic root of 400440077 is about 737.0764102827.

The spelling of 400440077 in words is "four hundred million, four hundred forty thousand, seventy-seven".