1770397445 has 18 divisors (see below), whose sum is σ = 2198841606. Its totient is φ = 1368372240.

The previous prime is 1770397439. The next prime is 1770397463. The reversal of 1770397445 is 5447930771.

It can be written as a sum of positive squares in only one way, i.e., 1416317956 + 354079489 = 37634^2 + 18817^2 .

It is not a de Polignac number, because 1770397445 - 2¹⁶ = 1770331909 is a prime.

It is a super-2 number, since 2×1770397445² = 6268614226525056050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1770397445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2916332 + ... + 2916938.

It is an arithmetic number, because the mean of its divisors is an integer number (122157867).

Almost surely, 2^1770397445 is an apocalyptic number.

It is an amenable number.

1770397445 is a deficient number, since it is larger than the sum of its proper divisors (428444161).

1770397445 is an frugal number, since it uses more digits than its factorization.

1770397445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 47.

The square root of 1770397445 is about 42076.0911326135. The cubic root of 1770397445 is about 1209.7350340750.

It can be divided in two parts, 1770397 and 445, that multiplied together give a triangular number (787826665 = T₃₉₆₉₄).

The spelling of 1770397445 in words is "one billion, seven hundred seventy million, three hundred ninety-seven thousand, four hundred forty-five".