1658401380 has 36 divisors (see below), whose sum is σ = 5030484732. Its totient is φ = 442240320.

The previous prime is 1658401379. The next prime is 1658401387. The reversal of 1658401380 is 831048561.

It can be written as a sum of positive squares in 2 ways, for example, as 1306388736 + 352012644 = 36144^2 + 18762^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1658401387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4606491 + ... + 4606850.

It is an arithmetic number, because the mean of its divisors is an integer number (139735687).

Almost surely, 2^1658401380 is an apocalyptic number.

1658401380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1658401380 is an abundant number, since it is smaller than the sum of its proper divisors (3372083352).

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

1658401380 is a wasteful number, since it uses less digits than its factorization.

1658401380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9213356 (or 9213351 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1658401380 is about 40723.4745570660. The cubic root of 1658401380 is about 1183.6679365002.

The spelling of 1658401380 in words is "one billion, six hundred fifty-eight million, four hundred one thousand, three hundred eighty".