400349977 has 4 divisors (see below), whose sum is σ = 400838436. Its totient is φ = 399861520.

The previous prime is 400349951. The next prime is 400349993. The reversal of 400349977 is 779943004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70963776 + 329386201 = 8424^2 + 18149^2 .

It is a cyclic number.

It is not a de Polignac number, because 400349977 - 2¹⁹ = 399825689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400349927) 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, 242998 + ... + 244639.

It is an arithmetic number, because the mean of its divisors is an integer number (100209609).

Almost surely, 2^400349977 is an apocalyptic number.

It is an amenable number.

400349977 is a deficient number, since it is larger than the sum of its proper divisors (488459).

400349977 is an equidigital number, since it uses as much as digits as its factorization.

400349977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488458.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 400349977 is about 20008.7475120258. The cubic root of 400349977 is about 737.0211248024.

The spelling of 400349977 in words is "four hundred million, three hundred forty-nine thousand, nine hundred seventy-seven".