3400639778 has 16 divisors (see below), whose sum is σ = 5526623520. Its totient is φ = 1563084096.

The previous prime is 3400639777. The next prime is 3400639783. The reversal of 3400639778 is 8779360043.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3400639777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161548 + ... + 1164471.

It is an arithmetic number, because the mean of its divisors is an integer number (345413970).

Almost surely, 2^3400639778 is an apocalyptic number.

3400639778 is a deficient number, since it is larger than the sum of its proper divisors (2125983742).

3400639778 is a wasteful number, since it uses less digits than its factorization.

3400639778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326081.

The product of its (nonzero) digits is 762048, while the sum is 47.

The square root of 3400639778 is about 58315.0047414900. The cubic root of 3400639778 is about 1503.7889070271.

The spelling of 3400639778 in words is "three billion, four hundred million, six hundred thirty-nine thousand, seven hundred seventy-eight".