400393730 has 32 divisors (see below), whose sum is σ = 787235328. Its totient is φ = 145411200.

The previous prime is 400393717. The next prime is 400393739. The reversal of 400393730 is 37393004.

It is a junction number, because it is equal to n+sod(n) for n = 400393693 and 400393702.

It is not an unprimeable number, because it can be changed into a prime (400393739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107174 + ... + 110846.

It is an arithmetic number, because the mean of its divisors is an integer number (24601104).

Almost surely, 2^400393730 is an apocalyptic number.

400393730 is a deficient number, since it is larger than the sum of its proper divisors (386841598).

400393730 is a wasteful number, since it uses less digits than its factorization.

400393730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682.

The product of its (nonzero) digits is 6804, while the sum is 29.

The square root of 400393730 is about 20009.8408289521. The cubic root of 400393730 is about 737.0479727375.

The spelling of 400393730 in words is "four hundred million, three hundred ninety-three thousand, seven hundred thirty".