400779541 has 4 divisors (see below), whose sum is σ = 402529900. Its totient is φ = 399029184.

The previous prime is 400779499. The next prime is 400779569. The reversal of 400779541 is 145977004.

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 337640625 + 63138916 = 18375^2 + 7946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400779541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400779541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400779581) 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, 874836 + ... + 875293.

It is an arithmetic number, because the mean of its divisors is an integer number (100632475).

Almost surely, 2^400779541 is an apocalyptic number.

It is an amenable number.

400779541 is a deficient number, since it is larger than the sum of its proper divisors (1750359).

400779541 is a wasteful number, since it uses less digits than its factorization.

400779541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750358.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 400779541 is about 20019.4790391758. The cubic root of 400779541 is about 737.2846313963.

The spelling of 400779541 in words is "four hundred million, seven hundred seventy-nine thousand, five hundred forty-one".