870290389 has 4 divisors (see below), whose sum is σ = 874415200. Its totient is φ = 866165580.

The previous prime is 870290387. The next prime is 870290417. The reversal of 870290389 is 983092078.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983092078 = 2 ⋅491546039.

It is a cyclic number.

It is not a de Polignac number, because 870290389 - 2¹ = 870290387 is a prime.

It is a super-2 number, since 2×870290389² = 1514810722371542642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870290387) 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, 2062089 + ... + 2062510.

It is an arithmetic number, because the mean of its divisors is an integer number (218603800).

Almost surely, 2^870290389 is an apocalyptic number.

It is an amenable number.

870290389 is a deficient number, since it is larger than the sum of its proper divisors (4124811).

870290389 is a wasteful number, since it uses less digits than its factorization.

870290389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124810.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 870290389 is about 29500.6845513795. The cubic root of 870290389 is about 954.7464725437.

The spelling of 870290389 in words is "eight hundred seventy million, two hundred ninety thousand, three hundred eighty-nine".