1390401894 has 64 divisors (see below), whose sum is σ = 3342643200. Its totient is φ = 377170560.

The previous prime is 1390401871. The next prime is 1390401937. The reversal of 1390401894 is 4981040931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58932 + ... + 79080.

It is an arithmetic number, because the mean of its divisors is an integer number (52228800).

Almost surely, 2^1390401894 is an apocalyptic number.

1390401894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390401894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1671321600).

1390401894 is an abundant number, since it is smaller than the sum of its proper divisors (1952241306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1390401894 is a wasteful number, since it uses less digits than its factorization.

1390401894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20245.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1390401894 is about 37288.0931934042. The cubic root of 1390401894 is about 1116.1265786335.

The spelling of 1390401894 in words is "one billion, three hundred ninety million, four hundred one thousand, eight hundred ninety-four".