1394632891 has 4 divisors (see below), whose sum is σ = 1394712112. Its totient is φ = 1394553672.

The previous prime is 1394632879. The next prime is 1394632901. The reversal of 1394632891 is 1982364931.

It is a happy number.

1394632891 is a nontrivial binomial coefficient, being equal to C(52814, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1982364931 = 1949 ⋅1017119.

It is a 3-Lehmer number, since φ(1394632891) divides (1394632891-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1394632891 is a prime.

It is a deceptive number, since it divides R_1394632890.

It is not an unprimeable number, because it can be changed into a prime (1394632801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 52813.

It is an arithmetic number, because the mean of its divisors is an integer number (348678028).

Almost surely, 2^1394632891 is an apocalyptic number.

1394632891 is the 52813-rd triangular number and also the 26407-th hexagonal number.

1394632891 is the 17605-th centered nonagonal number.

1394632891 is a deficient number, since it is larger than the sum of its proper divisors (79221).

1394632891 is an equidigital number, since it uses as much as digits as its factorization.

1394632891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79220.

The product of its digits is 279936, while the sum is 46.

The square root of 1394632891 is about 37344.7839865221. The cubic root of 1394632891 is about 1117.2575576903.

The spelling of 1394632891 in words is "one billion, three hundred ninety-four million, six hundred thirty-two thousand, eight hundred ninety-one".