1400670778 has 16 divisors (see below), whose sum is σ = 2296395360. Its totient is φ = 636813936.

The previous prime is 1400670773. The next prime is 1400670787. The reversal of 1400670778 is 8770760041.

It is a self number, because there is not a number n which added to its sum of digits gives 1400670778.

It is not an unprimeable number, because it can be changed into a prime (1400670773) 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, 400288 + ... + 403771.

It is an arithmetic number, because the mean of its divisors is an integer number (143524710).

Almost surely, 2^1400670778 is an apocalyptic number.

1400670778 is a deficient number, since it is larger than the sum of its proper divisors (895724582).

1400670778 is a wasteful number, since it uses less digits than its factorization.

1400670778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804141.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 1400670778 is about 37425.5364423812. The cubic root of 1400670778 is about 1118.8675783001.

The spelling of 1400670778 in words is "one billion, four hundred million, six hundred seventy thousand, seven hundred seventy-eight".