1401263878 has 24 divisors (see below), whose sum is σ = 2451934800. Its totient is φ = 598853808.

The previous prime is 1401263869. The next prime is 1401263921. The reversal of 1401263878 is 8783621041.

It is a self number, because there is not a number n which added to its sum of digits gives 1401263878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15268 + ... + 55096.

It is an arithmetic number, because the mean of its divisors is an integer number (102163950).

Almost surely, 2^1401263878 is an apocalyptic number.

1401263878 is a deficient number, since it is larger than the sum of its proper divisors (1050670922).

1401263878 is a wasteful number, since it uses less digits than its factorization.

1401263878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40204 (or 40197 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1401263878 is about 37433.4593378704. The cubic root of 1401263878 is about 1119.0254804349.

The spelling of 1401263878 in words is "one billion, four hundred one million, two hundred sixty-three thousand, eight hundred seventy-eight".