400961779 has 12 divisors (see below), whose sum is σ = 431956368. Its totient is φ = 372041600.

The previous prime is 400961767. The next prime is 400961791. The reversal of 400961779 is 977169004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400961767) and next prime (400961791).

It is not a de Polignac number, because 400961779 - 2¹³ = 400953587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400901779) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 10749 + ... + 30289.

It is an arithmetic number, because the mean of its divisors is an integer number (35996364).

Almost surely, 2^400961779 is an apocalyptic number.

400961779 is a deficient number, since it is larger than the sum of its proper divisors (30994589).

400961779 is a wasteful number, since it uses less digits than its factorization.

400961779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19646 (or 19629 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 400961779 is about 20024.0300389307. The cubic root of 400961779 is about 737.3963644091.

The spelling of 400961779 in words is "four hundred million, nine hundred sixty-one thousand, seven hundred seventy-nine".